I am looking for rules to create cursed items for the players.
one of my players wants to create a ceremonial dagger. She has to draw blood in order to use her spells. I get how that works, giving the spells she is casting a disadvantage that she has to draw blood, even her own if necessary. However, there is a thought to add a summon onto the dagger that once a threshold is reached it will automatically summon a monster of some form which the PC will have no control over.
I have started researching but haven’t found the rules that satisfy me. Any help would be greatly appreciated.