I have it!
I have the game, and the fifth Bhaal-spawn is (this post has been edited by Memnoch. Sorry mate! 
).
I mean, who would have guessed that!!!
Wow!!!
Gotta go play some more now!!!!
------------------
Larry,
Loyal guardian of the
OHF
Devoted member of the
Ironworks
Only member of the Elite Bodyguard to Rikard
(the fool that takes the bullet)
Ertai's back-up
Memnoch's chief look-out
Member of the
Ancients club