So, fighting Carmilla in Lords again last night, it occurred to me that the game could have hidden some "shadow endings" in the battles against Carmilla and Cornell that would be activated by basically surrendering during the battle, and allowing Gabriel to be defeated without fighting back. The endings could have shown Gabriel becoming either a vampire in the service of Carmilla or a werewolf in Cornell's, along with some narration by Zobek describing how with Gabriel's help, the Dark Lord he served brought darkness to all the lands of the Earth.
That would have been a neat touch.