Vokur Grimshackles

Location
If you have Chains of Enslavement on you, you can not attack him because he is a Stone Summit.
 * Sorrow's Furnace
 * during Orozar Highstone's quests, in one of 6 random boss spawn locations.
 * in the Gap, near Marshall Whitman.
 * in Sorrow's Belly.

Skills Used

 * Conjure Phantasm
 * Crippling Anguish (Elite)
 * Shatter Enchantment

Items Dropped

 * Enslavement Stone
 * Stone Summit Badge