Eldrantulku is a spirit of discord who turns allies into enemies and lovers into mortal foes. A master deceiver, his title comes from his ability to convince others to break their oaths. He is not a force of war - he corrupts the innocent, using ambition, jealousy, and paranoia as his tools. Like Sul Khatesh, Eldrantulku's release might go unnoticed: he would drift into the background, and cause princes and dragonmarked houses to turn on one another.
Source: Dragon 337
Eldrantulku is active within the Lords of Dust.
Notable minions include Thelestes, an exiled Mabaran
succubus and deadly assassin; and the devious
rakshasa Kashtarhak, his prakhutu. The location of
Eldrantulku’s prison is unknown.
Source: Chronicles of Eberron