Board Thread:Lore Discussion/@comment-71.226.242.68-20131113201112/@comment-25059584-20140711023511

As seen in the questline of teso, when meridia and the soulless one "Killed" molag bal (in coldharbour) his spirit went through the waters of oblivion and existed again, he then talked to meridia and the soulless one in the colored rooms afterwards

however, when boethiah ate trinimac he transformed into malacath, a new diety, so in essance they can somewhat be killed