Ceramic Tank

Aftermath. Ceramic Tanks explode upon death, dealing 3d4 slashing damage to creatures withing a 15 foot radius.

Container. Ceramic Tanks may hold 3 cubic feet of either water or oil. Tanks containing oil leak small amounts onto the floor within 5 ft of its location every 2 turns, and deal 1d6 fire damage to enemies within 10 ft when gaining the fire and flame bonus. Tanks containing water gain a vulnerability to bludgeoning damage, but deal double damage when exploding (does not change fire and flame bonus' damage when exploding).

Fire and Flame. Whenever the Tank comes into contact with high heat or fire, it gains the fire and flame bonus: tanks filled with oil gain +2 to their con during the duration of the effect and deal an additional 2d6 fire damage on melee attacks, and 1d8 fire damage whenever hit by a melee attack. Tanks filled with water lose half their maximum hp. If a tank dies this way, it explodes in a 20 ft radius, dealing 4d8 slashing damage to anything within 10 ft and 2d8 slashing damage to anything outside that.

Big Swing. The Tank makes two unarmed strikes to an enemy within 10 ft. Enemies hit this way are pushed away from the tank 5 ft and knocked prone. 

Greatsword. Melee Weapon Attack: +7 to hit, reach 5 ft., 2 target. Hit: 10 (2d6 + 4) slashing damage.

Fracture. The Tank cracks an opening in its chest, creating a pressure point that, when it explodes, shoots a stream of hot liquid 15ft forward, dealing 1d6 piercing damage and 1d6 fire damage to whatever it hits. Reduces AC by 2.

Earthquake. As a reaction to an attack, the Tank can stomp the ground, creating a small earthquake in a 5 ft radius around it. Any creature besides Ceramic Tanks or creatures of greater size than large within this range must beat a dex saving throw of 13, or be knocked prone. If the tank gets hit, it becomes staggered.