Faction of xenophobic (hating of other races) High Elves who believe the world should be for the children of the Tel-quessir (Eladrin - the first elves). Formed in 262 DR in response to the conquests by the The Netheril human empire, dedicated to removal of all humans from Faerûn. Consider Half-elf and Drow as bad as human. Tend to choose ancient elven forests for their activities.
( Also: https://forgottenrealms.fandom.com/wiki/Eldreth_Veluuthra )