Animated Practice Dummy

Purgatory. When The Animated Practice Dummy drops to 0 hit points, it instead gains the benefits of a long rest, returning to max hit points and regaining all used abilities. also, any creature that gets reduced to 0 hit points by the Animated Practice Dummy instead gains the benefits of a long rest, returning to max hit points and regaining all used abilities. The only way to stop this cycle is with a wish spell.

Sudden Determination. On its turn, the Animated Practice Dummy may choose one of two effects. Either it focuses on its defense and reduces all damage it takes to 0 for the next 2 turns, or it focuses on offence and automatically crits on any target it hits for the next 3 turns. After the effect ends, the Animated Practice Dummy must wait 10 turns to use this action again.

Battle Worn Dagger. Melee Weapon Attack: 2+ to hit, reach 5 ft. Hit: 6 (2d4 + 2) slashing damage.

Parry. When the Animated Practice Dummy gets hit with a ranged or melee attack, it may take its reaction to instead block the attack and reduce the damage to 0.