When you hit a Small or larger creature with an attack using this weapon, it gains 1 charge as the pressure within builds, up to a maximum of 4 charges. If no charges are expended for 1 minute, the weapon loses all charges as it depressurises.
B.O.N.K. As a bonus action while holding this weapon, you can expend 1 charge to activate its built in engine and boost the next attack you make with it before the start of your next turn, which deals an extra 1d8 bludgeoning damage on a hit.
B.O.O.O.N.K. As an action while holding this weapon, you can expend 3 charges to fire a bolt of lightning in a 30-foot long, 5-foot wide line. Each creature in the line must make a DC 16 Dexterity saving throw, taking 6d8 lightning damage on a failed save, or half as much damage on a successful one.
Proficiency with a Warhammer allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Push. If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.
Notes: Versatile, Push
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