Temperature Dropping

In life, the frost-mage Ethreain (not yet a Lich) had used the threat of destructive ice to enslave entire kingdoms. His subjects, aided by a few desperate magicians, eventually grew bold enough to ambush him. Armed with enough charmed rope to bind him forever, they tied the frost mage to adamant weights and dropped him in a pool known chiefly for being bottomless. It wasn’t. He only fell for a year or so before an outcrop snagged him. There he rested, dead but undecaying, until the geomancer Anhil thought