The Forest of Illirium was the realm of the elves at the time of the story shown in Overlord: Dark Legend. The forest was the realm of King Erasmus, a great friend of a human noble known as Lord Grenville and an unlikely ally of the dwarf king Widget of Golden Hills. Illirium is divided in four regions: the Verdant Valley, the Plant Garrison, the Putrid Pools and the Hot Houses.