Two Dark Urge moments. Super massive SPOILERS of a core story plot twist no other custom character or origin can see:
----MASSIVE SPOILERS----
The revelation that the Dark Urge was the mastermind and architect of the entire Absolute plot only to be betrayed by Orin at the last minute.
The revelation of Jergal and his intervention to save the player character's life and soul after rejecting Bhaal as the Dark Urge. Possibly the most epic scene in the history of gaming.
In terms of non-spoiler territory, everything Minthara related in Act 1 and most of the dark Shadowheart questline.
