Got to say, I really hope this isn't Jergal. It seems like a serious misuse of one of the most powerful, important, and enigmatic entities in the setting to casually introduce him in the first 20 minutes of the game and then have him sit around camp, unremarked upon by companions or npcs, as essentially a gameplay convenience for if players get bodies stuck in unreachable locations and need to resurrect. Ideally npc priests would do that like in BG I+II, but afaik Larian just doesn't trust players to not kill them and leave themselves in a situation where they can't resurrect?

It's possible(likely even) that he'll become plot relevant later on, but his implementation right now just feels very awkward. A complaint that pops up now and again (and one that I feel is warranted) is that the game wants to be far to epic right out the gate. Having the OG god of death show up out of nowhere in the first hour of the game, ambiguously allude to greater powers commanding him/having a vested interest in you, and then turn into a glorified debug vendor just....takes me out of it whenever I remember he's there. (which is easy to forget, because the party members don't care/notice his presence)

That being said, even if he was just an original character lich or whatever, having a creepy undead park itself in your camp with no option to expel it is really odd from a rp perspective. You can tell him to leave, he refuses....and that's that. Can't bring it up with your companions even. "hey anyone concerned with the lich next to the river?"