I feel like expecting a DLC based on the hells for Karlach is doomed to be disappointing. Because she could very likely just die. I don't think that, creatively speaking, basing a DLC on something hinging on a character who very likely dies in the game is t all a smart choice. The problem with how open-ended this game is is that trying to pick up any given thread for a DLC wouldn't work, because plenty of players may have just not picked up the thread, or may have tied it up in some way already and so picking it up again just invalidates the choices of lots and lots of players.