Chromatic Rapier

Rapier of Loyalty. The Rapier takes a turn after its master and uses its action in its master's best interests.

Unstable Form. While the Chromatic Rapier is grappled, restrained, or has speed of 0, its armor class becomes 18 and cannot use its spinning rapier attack.

Multiattack. The Rapier makes two attacks: one Chromatic Rapier strike and one Spinning Rapier. The Rapier's attacks are magical.

Chromatic Rapier Strike. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 12 (1d8 + 7) piercing damage plus 21 (6d6) acid, cold, fire, lightning, or poison damage (Rapier’s choice).

Spinning Rapier. Each creature within 10 ft must make a DC 19 Dexterity saving throw. On a failed save, the target takes 16 (3d10) magical bludgeoning damage and falls prone. On a successful save, the target takes half as much damage and isn’t prone.