How does a contract with a devil or an entity mid campaign work in terms of levels?
I was wondering how it would work if players fought a devil in Avernus or something and managed to scare him enough for him to sign a contract that is in one of the PC's advantage, how would it work? Would that pc who is benefiting from it take a level or some levels in warlock if the contract offers power or will he just take extra effects and benefits like boosts or something? And if it's a contract to utilize a weapon for example would he get to be a hexblade warlock? Then he wild need 3 levels for the subclass which is weird since the contract is signed instantly, please explain to me how it would work I'm really curiouse and thanks!