Eli Shadowstaff was formerly a cleric of Corellon Larethian.
“Somehow” he succumbed to Devilish temptation and left the church.
* Current status *
After the party’s assault on the Death Cult’s hidden chapel, Eli attempted to teleport away. His teleport was blocked by some sort of infernal entity and he spontaneously combusted shortly thereafter.
He appears deceased, but doubt lingers as to the finality of his passing.