Tbe battle guitar is a magic weapon that switches between 2 forms, battleaxe form and guitar form, via a Command word, this weapon does counts as a common battleaxe and not a magic weapon to overcome Resistances or Immunities, can be used to cast Spells in Guitar form when attended to a bard.
Proficiency with a Battleaxe 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.
Topple. If you hit a creature with this weapon, you can force the creature to make a Constitution saving throw (DC 8 plus the ability modifier used to make the attack roll and your Proficiency Bonus). On a failed save, the creature has the Prone condition.
Notes: Bard, Damage, Combat, Versatile, Topple
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