If they are going to do this then make it realistic, Your first six months with the NPC will raise all stats by 50 after which a steady decline will occur, a permanent mana drain will be applied to your toon with a debuff called Marriage. All gold earned will now go into storage none of which you will be able to spend. If you manage to reach endgame expect to either die and permanently lose your character or re spawn with nothing more than your starting slave armor.
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Aloha Mr Hand !
Still can just play divinity original sin