:Seems simple enough to me.  So Bartuc and Horazon were slain - why's that a problem?  Hell is where bad folks go when they die.  Seems reasonable to me that if an evil person were sufficiently useful, the demons would dust him off and send him back into the fray.  Thus, Bartuc the Bloody was probably the undead version of the Warlord of Blood.  The Summoner is definitely not Horazon; it's almost certain that Horazon was devoured by his own "pets" long ages ago.  (Interesting note:  Horazon's journal has the same voice as the journals throughout Diablo 1 - but some of those were written by Lazarus.  So apparently that's neither Horazon's nor Lazarus's voice, but merely a narrator.)