Campaign idea: The party at lvl one gets sent to kill a sort of brigand, a minor noble whose family has been disgraced and is now taking it out on the neighboring duchy. He’s very big physically but nothing special so they win fairly readily. They move on, but the guy’s nerdy brother doesn’t. He comes back from a decade spent studying abroad, and uses necromancy to bring back the brother. He makes his brother into a revenant, unkillable, coming back stronger after every defeat within hours, trying to kill the party constantly, but at a walking pace.