GURPS: The Known World
The Draleth is an extinct race of giants, thought to have dwelled around the Moonsfall Mountains in the eastern part of the Known World, before the Age of Ice.
The Draleth were grey of skin, and stood about ten feet tall. They are thought to have been highly advanced in both magic and technology.
Unfortunately, Draleth shamans summoned a powerful Demon that destroyed their civilization.
This Demon – and Sir Drac Evonford, its champion – was later vanquished by Corwin Giantson, Decius Malthus, Harlon Thane and Ekko Fat-Fellow. Rumours speculate that a fifth adventurer was somehow involved.