u/Fridgeta

Hello, I need some advise on how to upgrade a homebrewed item I gave a player.

The item in question is a 'spellcaster crossbow'. This allows the player to use a weapon attack to shoot an attack spell. The downside being that if they cast something like magic missile all of the missiles must go to a single target.

I'm struggling for a way to upgrade this item. I want to do more than simply give it a +1. But at the same time I recognise how broken this item could become. Anyone have any suggestions?