The Citadel of Chaos

Calacorms are reliable and contented creatures.
They are large reptilian beasts, with grey skin, long tails and two heads,
which chatter at each other incessantly.
They want for little, having no great ambitions in life beyond their jobs,
their food (they live on dead snakes) and their home comforts.
Rather out of character with their placid nature is their great delight
in the screams and pain of torture and, strangely enough,
these creatures are for some reason scared to death by mice,
in spite of their huge size.