so I saw the epilogue and right now im hopeful that fixing karlach heart and that certain DLC is going to be a real thing in the future, because if that certain DLC is not going to be a thing, I don't know how they are going to explain all the possible solutions that the base game tells you unless they change the base game and after all this time if they haven't done it by now I don't think they are going to do it.I could see Larian saying: you remember all those possible ways to help karlach we told you in the base game? well they are all available in that DLC. What im trying to say is that I could be wrong but between changing the history and quests of a character in ACT 3 and adding a DLC with the definitive solution to karlach heart being a part of it(because Larian is not going to do a DLC just to fix a character problem is going to be a side thing and that's it) I think the DLC is the most possible solution.