Arnheim was a High Elf colony and port city built on the eastern Black Coast of the continent of Naggaroth.[1a]
In 1783 IC, the Dark Elf raiders of Yrtain Nightwind attacked Arnheim after their scouts discovered tunnels beneath the swamps and mountains that protected the settlement's northern approaches.[2a]
Later in VII, 222 (XI, 359) (2522 IC), the Witch King Malekith himself led an assault on Arnheim, obliterating it.[1a]