Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General Can’t enter Doctor House

I think only Lohse can open the door. There are two fish scrolls about (and a third in the basement, I think - where you can't yet go) so you might still be able to go that route. I THINK there's one in Arx somewhere. The others are on Bloodmoon Island and at the fish factory in Driftwood (possibly 2) so, you can't get those anymore.