Hallucinations come in a few different forms, depending on their source.
Failing a spell may cause hallucinations. These come in the form of periodic chats.
They'll sometimes (though not always) prevent you from casting a spell or performing a ritual:
You prepare to cast a spell but you stop and gawk at the blue spiders spinning a giant web that are singing a rousing drinking song on your shoulder.
You prepare to perform a ritual but you gaze dreamily at the orange pygmies wielding letter openers that are flying in circles around your head.
They will also frequently interfere with combat:
You move to attack the polite youth but instead you stand and gawk at the red and white striped floppy hats (which seem to be grinning at you) that suddenly appear in mid-air in front of you.
(While already fighting.) It seems that there are some hallucinations that look like they interfere but don't.
There are also a few other things that cause this type of hallucination:
- mushroom pizza from The Little Seriph's on Short Street in Ankh-Morpork.
- Amanita Liquor from the The Mended Drum
- dried frog pills (which will also poison you slightly)
- acorn coffee, but the effect is extremely short-lived--a few seconds for drinking a mug of it.
- Licking bright coloured frogs.
The Visions ritual can cause more severe hallucinations. Apart from periodic chats, they may stop you from looking at things some of the time (including looking at the room you're in, making navigation difficult). They can also prevent spells, rituals and some commands.
However, the strength of the effect varies greatly.
When you look at someone who is hallucinating from spell failure or visions, you can see a random line below shields and above items like:
- She appears to be staring at something.
- She appears to be staring at someone on her left shoulder.
- She appears to be staring at something that isn't really there.
- She appears to be staring at some hairless orange elfses (dancing a jig).
- She appears to be staring at some naked ultramarine platypi (dancing a tarantella).
- She appears to be staring at some floppy dazzling pink hats (giving you funny looks).
- She appears to be staring at some vermilion coiled springs with sharp ends (who haven't slept in years).
- She appears to be staring at some iridescent blue dancing cabbages (who seem to be nibbling on her brain).
- She appears to be staring at some adorable dazzling pink baby mandrake roots (who look good enough to eat).
- She appears to be staring at some one-eyed, one-humped biting puce camels (who are definitely staring back).
- She appears to be staring at some fuchsia coiled springs with sharp ends (who bounce around in obvious delight).
Mugwuddle's Muddling Mirage
The spell Mugwuddle's Muddling Mirage causes a large, unified hallucination for the target. This hallucination prevents you from looking at anything, going in the direction you intend, casting spells or performing rituals, or fighting anyone. It also makes you wander randomly.
Unlike the other types of hallucinations, these are broken if you're attacked.
When you look at someone who is hallucinating from Mugwuddle's Muddling Mirage, you can see a random line below shields and above items like:
- She looks lost.