I made a weapon to give to my party at level 5. Is this overpowered to give (one) to a level 5 party of 4 characters?
The Halting Rod
Uncommon (unique), 2 lbs.
2d4 force damage
Properties: Light, Finesse, Special (Use of special feature requires attunement)
Whenever the wielder of this weapon is attacked by a melee weapon, they can use their reaction to make an special non-damaging attack roll with the weapon, the AC for which is 11 plus the attacker's attack modifier. On a successful hit, the attacker's damage is stopped. Twice per day, when the wielder successfully blocks an attack with this weapon, they can cast thunderwave (save DC 16) as a second-level spell centered halfway between themselves and their attacker.