Hand Crossbow Bolt of Idiocy

On a successful hit with a hand crossbow, in addition to dealing damage, the target must succeed on DC 12 Will saving throw or be unable to cast spells. If the target is not a spellcaster, this bolt has no effect. It must be declared (turned in) before sliding the weapon token.

Note: Attacks made with this ammunition deal a total of 0 HP damage–whether the saving throw was successful or not.