Silver rat ring
What is it?
It is a magical piece of jewellery, an artifact. It's description reads:
This is a thick silver band, embossed with a circle of three rats biting on each other's tails. Each rat has two tiny red rubies for eyes. <number> of its eyes glow a dull red. It emits a slight octarine glow. It is in excellent condition.
What does it do?
You can wear the ring, and if you twist it and have sufficient skills (ma.it.wo.ring?), you will summon a rat that will protect you. This rat is a lot tougher than normal rats, though.
The number of charges seem to be equal to the number of glowing eyes on the ring.
How do I get one?
In the Rat Farm you will sometimes encounter a rat king. Once the rat king is defeated, the rats that scatter leave behind a ring. The ring always has the same amount of glowing eyes as the number of tails that the rat king had. This seems to always be between 4-6.