The Lone Survivor of a Banished House
Use the stats for Mindshard (Drow of the Underdark, page 163) for Jhalefein.
Jhalefein is a male drow with long nails and terrible scars across his partially bald head and throat. He cannot speak above a whisper.
Jhalefein served House Eilservs in Erelhei-Cinlu, the infamous Vault of the Drow on Oerth. When that House’s matron, Eclavdra, forsook Lolth and embraced the Elder Elemental Eye, Erelhei-Cinlu was plunged into civil war. Jhalefein was almost killed by a mind flayer, but was saved by a comrade, who fell in battle shortly thereafter. With the House crumbling all around him, Jhalefein fled through a portal to Sigil.
Jhalefein believes himself to be the only survivor of House Eilservs, and has dedicated his life to destroying the victors of the civil war, House Tormtor. Half-mad and paranoid, he shuns contact with others, save for when they might serve his mission.
Illustration by Wayne England, from Drow of the Underdark.