Wand, rare (requires attunement by a Spellcaster)
This wand has 7 charges. While holding it, you can use an action to expend 1 of its charges to cause a thin blue ray to streak from the tip toward a creature you can see within 60 feet of you. The target must succeed on a DC 15 Constitution saving throw or be paralyzed for 1 minute. At the end of each of the target's turns, it can repeat the saving throw, ending the effect on itself on a success.
The wand regains 1d6 + 1 expended charges daily at dawn. If you expend the wand's last charge, roll a d20. On a 1, the wand crumbles into ashes and is destroyed.
Notes: Paralyzed, Spellcaster, Control, Debuff
rad
This does not cast a spell.
Meaning that in the hands of a Sorcerer, this is deadly.
Quicken a spell like Mind Sliver to penalize a saving throw before using it with your action. Even better if the Sorcerer has the magic item Shadowfell Shard, quicken Mind Sliver, and then the target has Disadvantage and -1d6 on their Con save against this.
That's a very good catch, nice idea!