Yeah. I was shocked to realize that the evil Dark Urge ending (which is probably the "default" ending for that storyline) is exactly the same as the basic 15 seconds evil ending, with one added line.
Weirdly, this was probably the better last choice to pick. I reloaded and decided to defy Bhaal in the last second, and for that I've got the must surreal and awkwardly cut together sequence of clips. It started with people making happy and funny comments at the pier, but then (cue ominous music) a dark turn: my main char grew some evil glowing red eyes and wandered of. Cut. Cue sad music. Karlach is dying. My main decides to go with Wyll and her to Avernus. Cut to some street pictures. Finally a Marvelesque bad-ass sequence in Avernus with uplifting action music. The end.
It was a weird tonal mess that made me laugh out at how bad it was.