Impemon

Impemon was an event that ran multiple times for April Fools.

1 April 2017 to 8 April 2017 - 25 impemons
1 April 2018 to 8 April 2018 (Impemon Yellow)
1 April 2022 to 8 April 2022 (Impemon Fire Red) - 26 impemons

Mechanics

Once you have an impedex, you can use the following commands:

battle <living> with <imp>  Challenge someone or someimp to an impemon battle.
release <imp>               Leave one of your imps out to follow you around.
return <imp>                Return one of your imps to your impedex. (When an imp is released and following you.)
name <imp> <string>         Give your imp a name. (When an imp is released and following you.)
capture <imp>               Capture an escaped impemon (that appeared in the room).
abandon <imp>               Cut ties with an imp that you've released, allowing you to catch another imp of that type instead.  (When an imp is released and following you. The imp will kick you in the shins!)

Players holding an impedex while exploring the disc can discover impemons hiding in the rooms.

The impemons can be captured into the impedex, battles can be fought between captured and wild impemons or the captured impemons of two players.
You have limited time to interact with the impemon before it disappears. This was measured once to be 2 minutes.
Some impemons are shiny!

Sometimes when you enter a room while holding the impedex you see:

Your impedex says with a Bes Pelargic accent: Imp detected.
Your impedex shines a beam of octarine light at the room, making a shiny Lancre Ness impster fade into visibility.
[...] (after 2 minutes)
The shiny Lancre Ness impster fades back into invisibility.

To put the escaped impemon into your impedex you can do capture <imp>.

This requires some fighting.unarmed.grappling skills. A bonus of 61 is not enough to succeed, but 128 is.
If you already have an impemon of that type you cannot add a second. However you can release and abandon the previous one, for example if you want to replace the normal impemon with a shiny impemon.

You can scan <imp> with <impedex> to ask the impedex for information about an impemon.

Most of this information seems random and useless, but the Elemental affinity and Favourite colour seem to stay the same for the same type of impemon.

Professor Shrub

White-haired, bearded, and ruggedly handsome, this wizard does have a bit of a scatter-brained look over him. A magical researcher, Professor Shrub has sometimes been known to be a little... erratic.
He is in good shape.
He is standing.
Holding : an old staff (left hand and right hand).
Wearing : a white cotton robe and a pointy wizard's hat.

You say in Agatean: help
Professor Shrub exclaims in Agatean with a Bes Pelargic accent: You want to help? Oh, that's wonderful!
Professor Shrub says in Agatean with a Bes Pelargic accent: You see, I've been doing some experiments again...
Professor Shrub exclaims in Agatean with a Bes Pelargic accent: Nothing bad! Just some fiddling with space, time and the nature of magical creatures!
Professor Shrub says in Agatean with a Bes Pelargic accent: But it seems I have been a little careless, and some of my experiments escaped, again.
Professor Shrub frowns.
Professor Shrub says in Agatean with a Bes Pelargic accent: They're magically mutated imps. I just don't have the time to travel the world to catch them all.
Professor Shrub exclaims in Agatean with a Bes Pelargic accent: But I'm sure an adventurer like you can do it!
Professor Shrub asks you in Agatean with a Bes Pelargic accent: Are you up to it?
Professor Shrub frets about consequences again.
Professor Shrub frets about consequences again.
You say in Agatean: yes
Professor Shrub exclaims in Agatean with a Bes Pelargic accent: Fantastic!
Professor Shrub says in Agatean with a Bes Pelargic accent: In principle, it's not hard to recognise them. My imps all look like some kind of magical monster.
Professor Shrub exclaims in Agatean with a Bes Pelargic accent: I call them... impemons!
Professor Shrub grabs a scroll from somewhere and gives it to you.
Professor Shrub says in Agatean with a Bes Pelargic accent: Now, in their usual state, impemons are invisible.
Professor Shrub says in Agatean with a Bes Pelargic accent: You'll need this scroll to see them. And it'll explain everything.
Professor Shrub exclaims in Agatean with a Bes Pelargic accent: Come to me for a reward once you catch them all!

Impedex

The letters on the scroll rearrange themselves into a more familiar language.
This is a magical scroll that lets you see and capture invisible imps when it's held.  It's made out of thin, ephemeral-looking paper with glowing lettering that changes as you read it.
A shimmer of octarine radiates across the surface.
It has the hazy octarine sparkle of a magical talisman.
It appears to have something written on it.

The letters on the scroll rearrange themselves into a more familiar language.
You read the impedex:
Written in glowing letters:
So far, you have caught:
An unnamed level 1 impicorn
With a total of 1 imp.  
You can currently use the following commands: battle, release, return, capture, scan.
Note that you should hold this impedex to find and catch impemon.

As you hold the impedex, the glowing lettering on it flares with an octarine light.
You hold an impedex in your left hand.

impemon fire red              Discworld player help             impemon fire red


Name
     Impemon Fire Red - Happy April Fools' Day!                                 

Syntax
     battle <player/wild imp> with <imp name>                                   
     accept battle from <player> with <imp name>                                
     name <imp> <name>                                                          
     release <imp name>                                                         
     return <impemon>                                                           
     capture <impemon>                                                          
     abandon <impemon>                                                          

Description
     Impemon Fire Red: Now with shiny imps!!!  Catch them, battle them, collect 
     them all!                                                                  
     (While stocks last.  Terms and conditions apply.)                          

Capturing impemon
     To find impemon, simply explore the Disc while holding your impedex.  Some 
     degree of grappling skill may be required to capture these delicate        
     creatures.                                                                 
     Occasionally, you may find a shiny impemon!  You might have to abandon your
     existing impemon to make space for it.                                     

Battling impemon
     Impemon battling is a mysterious and rarely-explored topic.  Some types of 
     impemon might always defeat certain other types of impemon.  At other      
     times, the result is entirely random.  Even scanning them with the impedex 
     rarely yields useful information.  It is known, however, that impemon      
     become stronger though battling.                                           

Collecting impemon
     After you collect all 26 types of impemon, something special might happen! 
     Or it might not.                                                           

Terms and conditions
     Impedex only valid until 8 April.  Do not operate heavy machinery.  May    
     contain imps.

After the event the impedex is depowered:

This is a nice sheet of writing paper with the edges dyed fiery red.
It appears to have something written on it.

You read the piece of writing paper with fiery red edges:
Written in shiny black ink in Agatean:
You caught:
An unnamed level 1 sphimpx
An unnamed level 1 mermimp
Uni, the level 2 shiny impicorn
Cen, the level 5 shiny centimp
An unnamed level 1 basilimp
Grif, the level 3 shiny grimpyn
An unnamed level 1 would nimph
An unnamed level 1 dryimp
Fe, the level 2 shiny Imp Nac Feegle
An unnamed level 1 vimpyre
An unnamed level 1 Impa Yaga
Bas, the level 1 shiny banshimp
An unnamed level 1 Dr Frankenimp
An unnamed level 1 Frankenimp's monster
An unnamed level 1 dragimp
Nes, the level 4 shiny Lancre Ness impster
An unnamed level 1 impotaur
An unnamed level 1 medusimp
An unnamed level 1 grimp reaper
Si, the level 3 shiny sirimp
Hy, the level 1 shiny himpogryph
An unnamed level 1 imp
Suc, the level 2 shiny impubus
An unnamed level 2 phoenimp
An unnamed level 1 shrimp
Bos, the level 12 bossimp
With a total of 26 imps.  Congratulations!

Elemental affinities

Favorite colour	Elemental affinity	Strong against	Weak against	Impemons
Blue	Cold	Gas & Acid	Lightning & Fire	basilimp, dryimp, Impa Yaga, medusimp, vimpyre
Yellow	Gas	Lightning & Fire	Acid & Cold	banshimp, dragimp, grimpyn, himpogryph, Imp Nac Feegle, would nimph
White	Lightning	Acid and Cold	Fire & Gas	centimp, Dr Frankenimp, Frankenimp's monster, grimp reaper
Red	Fire	Cold & Lightning	Acid & Gas	imp, impicorn, impubus, phoenimp, sphimpx
Purple	Acid	Fire & Gas	Lightning & Cold	impotaur, Lancre Ness impster, mermimp, shrimp, sirimp
Black	Like a boss	?	?	bossimp

List of impemon

banshimp

Legend has it that the impshee will shriek from the rooftops if Death approaches.  Unfortunately, only dogs can hear the high-pitched sound.
It is in good shape.
It is shrieking inaudibly.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Gas.  Strong against lightning and fire.
Your impedex says with a Bes Pelargic accent: Favourite colour: Yellow.

basilimp

The basilimp is a small green gecko with very large, piercing eyes and a forked tongue.  As it gazes at you, you seem to get a small headache behind your eyes.
It is in good shape.
It is tasting the air.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Cold.  Strong against gas and acid.
Your impedex says with a Bes Pelargic accent: Favourite colour: Blue.

bossimp

This suit-wearing imp is a little bigger than the others.  Its shiny tie glows with a warm, legendary-looking light.
It is in good shape.
It is sitting at a tiny desk.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Like a boss.
Your impedex says with a Bes Pelargic accent: Favourite colour: Black.

centimp

You hear the clip-clop of the centimp's hooves before you see him.  When you see him, you suddenly understand why people think genetic modification is such a bad idea.
It is in good shape.
It is clip-clopping around.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Lightning.  Strong against acid and cold.
Your impedex says with a Bes Pelargic accent: Favourite colour: White.

Dr Frankenimp

Dr Frankenimp is wearing a surgical mask and is holding a very small hacksaw.  He has the tendency to shout "IT'S ALIVE!" whenever he sees a static discharge.
It is in good shape.
It is shouting IT'S ALIVE.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Lightning.  Strong against acid and cold.
Your impedex says with a Bes Pelargic accent: Favourite colour: White.

dragimp

Commonly rumoured by those who have never seen one to be small replicas of the enomormous, fire-breathing dragons of myth, in reality these are nothing more than a common imp, albeit with a few very uncommon features!  Dressed from head to toe in sequins, giant wigs (for an imp) and exotic stage makeup that can only be described as being somewhere just this side of 'circus clown', the dragimp is a true performer, and can usually be found in its natural habitat, a nightclub, belting out popular songs of the day.
It is in good shape.
It is belting out a popular song.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Gas.  Strong against lightning and fire.
Your impedex says with a Bes Pelargic accent: Favourite colour: Yellow.

dryimp

his bark-covered dryimp is no thicker than your finger, and looks like a stiff breeze would blow her over.  If you're thinking "Baby Groot", you've got the right idea.
It is in good shape.
It is rooted to the ground.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Cold.  Strong against gas and acid.
Your impedex says with a Bes Pelargic accent: Favourite colour: Blue.

Frankenimp's monster

Frankenimp's monster is tiny, green and has a flat head.  There's stitches all the way around his head, and a bolt sticking through his neck.  For some reason, magnets stick to his head.
It is in good shape.
It is standing.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Lightning.  Strong against acid and cold.
Your impedex says with a Bes Pelargic accent: Favourite colour: White.

grimp reaper

The Grimp Reaper, Death of Imps, has blue eyes and is holding a surprisingly large scythe.  It (he? she? Who can really tell?) is riding a skeletal impicorn.
It is in good shape.
It is riding a skeletal impicorn.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Lightning.  Strong against acid and cold.
Your impedex says with a Bes Pelargic accent: Favourite colour: White.

grimpyn

With fierce talons as sharp as needles, the body of a lion cub and the wings and head of a starling, this grimpyn is standing guard over a nest.  The nest contains many glinting golden chocolate coins.
It is in good shape.
It is standing guard over a nest.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Gas.  Strong against lightning and fire.
Your impedex says with a Bes Pelargic accent: Favourite colour: Yellow.

himpogryph

The himpogryph is a mythical imp which has the front half of a sparrow and the hind half of a dog, albeit a very small dog.  Perhaps a chihuahua.  Mythical creatures are weird, yo.
It is in good shape.
It is flapping.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Gas.  Strong against lightning and fire.
Your impedex says with a Bes Pelargic accent: Favourite colour: Yellow.

imp

The stereotypical imp.  Carrying a small pitchfork and waving its long forked tail in the air, it seems resigned to the fact that it's been superseded now by "alternative imps", none of whom seem to live up to the original.  In its humble opinion.
It is in good shape.
It is waving its long forked tail in the air.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Fire.  Strong against cold and lightning.
Your impedex says with a Bes Pelargic accent: Favourite colour: Red.

Imp Nac Feegle

The Imp Nac Feegle are tiny, yellow creatures with blue hair.  Legend says they enjoy a nice saucer of milk, but few have reported back on whether this is true or not.  Perhaps there's a reason for this.
It is in good shape.
It is looking for a barfight.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Gas.  Strong against lightning and fire.
Your impedex says with a Bes Pelargic accent: Favourite colour: Yellow.

Impa Yaga

This strangely ugly imp has strawlike hair, carries a pestle and is flying past in a mortar.  After a few moments, a small house runs past, carried on yellow webbed feet.
It is in good shape.
It is flying past.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Cold.  Strong against gas and acid.
Your impedex says with a Bes Pelargic accent: Favourite colour: Blue.

impicorn

At first, the impicorn could be mistaken for a miniature pony.  That is, until his horn turns you into a human doughnut.  That's no pony.  Come to think of it, that's not raspberry jam leaking out from inside you, either.
It is in good shape.
It is tossing its mane.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Fire.  Strong against cold and lightning.

impotaur

uarding the Labyrimpth, the impotaur is the fiercest of all imps, with the body of an imp and head of a very small bull.  His twin horns threaten to gore any ankles that are foolish enough to enter his domain.
It is in good shape.
It is guarding the Labyrimpth.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Acid.  Strong against fire and gas.
Your impedex says with a Bes Pelargic accent: Favourite colour: Purple.

impubus

An impubus has only one thing on its mind.  Forever lusting after it, this one seems to be muttering something about potatoes.
It is in good shape.
It is muttering something.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Fire.  Strong against cold and lightning.
Your impedex says with a Bes Pelargic accent: Favourite colour: Red.

Lancre Ness impster

Long thought to be a myth, the Lancre Ness Impster is... hang on.  You can't quite make it out.  It's kind of blurry, as though you're taking an iconograph of it through a super long zoom lens.  Maybe it's a pigeon.
Someone seems to have spilled glitter on it, making it sparkle excitingly.
It is in good shape.
It is blurry.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Acid.  Strong against fire and gas.
Your impedex says with a Bes Pelargic accent: Favourite colour: Purple.

medusimp

Medusimp, with her mass of writhing repilian hair and deadly gaze, would be terrifying to behold if she hadn't just caught sight of her reflection in a nearby puddle and was now, for all intents and purposes, an ugly garden gnome.
It is in good shape.
It is frozen solid.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Cold.  Strong against gas and acid.
Your impedex says with a Bes Pelargic accent: Favourite colour: Blue.

mermimp

With long, wavy hair and the tail of a fancy guppy, the mermimp is possibly the cutest imp to be seen.  Just don't call her Ariel.
It is in good shape.
It is flopping around.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Acid.  Strong against fire and gas.
Your impedex says with a Bes Pelargic accent: Favourite colour: Purple.

phoenimp

Magnificently coloured with gold and red feathers, the phoenimp is the size of a canary.  This one seems to be nesting in a small pile of ash.  How curious.
It is in good shape.
It is nesting in a small pile of ash.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Fire.  Strong against cold and lightning.
Your impedex says with a Bes Pelargic accent: Favourite colour: Red.

shrimp

This imp was late to the party, and has dressed like a lobster.  He didn't read the memo properly.
It is in good shape.
It is looking awkward.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Acid.  Strong against fire and gas.
Your impedex says with a Bes Pelargic accent: Favourite colour: Purple.

sirimp

From a distance, you can hardly even notice the Sirimp's tiny sharp teeth.  The song of the sirimp is reputed to be the most beautiful thing you'll ever hear for the rest of your life.  If you're hearing the Sirimp's song, you're about to have your face eaten off, so that is probably true.
Someone seems to have spilled glitter on it, making it sparkle excitingly.
It is in good shape.
It is humming a tune.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Acid.  Strong against fire and gas.
Your impedex says with a Bes Pelargic accent: Favourite colour: Purple.

sphimpx

The sphimpx has the head of an imp and the body of a very small house cat.  For some reason, this sphimpx has no nose.
It is in good shape.
It is curled up.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Fire.  Strong against cold and lightning.
Your impedex says with a Bes Pelargic accent: Favourite colour: Red.

vimpyre

The vimpyre has teeny tiny fangs poking out from behind his blood-red lips.  He vants to suck your bvlood, but due to his size he needs to bite you on the finger, instead of the neck.
It is in good shape.
It is looking hungry.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Cold.  Strong against gas and acid.
Your impedex says with a Bes Pelargic accent: Favourite colour: Blue.

would nimph

This would nimph, not to be confused with the homophonically named wood nymph, is an intriguing creature.  Unlike the nymph, this nimph has no association with forests, but is named a 'would' nimph because the first question that any brave explorer must ask themselves upon discovering one is, "If I do not run now, would this nimph chew off my face?"  The answer to that question is typically, "Yeaarrggghharble".
It is in good shape.
It is chewing on something.

Your impedex says with a Bes Pelargic accent: Elemental affinity: Gas.  Strong against lightning and fire.
Your impedex says with a Bes Pelargic accent: Favourite colour: Yellow.

External links

Impemon: Gotta Capture 'em All! article in Edition 181 of The AM Daily, published Mon Apr 3 2017.