Crimson Tank

Legendary Resistance (3/day). If the Crimson Tank fails a saving throw he can choose to succeed instead.

Magic Resistance. The Crimson Tank has advantage on saving throws against spells and other magical effects.

Aberrant Ground. The ground in a 10-foot radius around the mouther is doughlike difficult terrain. Each creature that starts its turn in that area must succeed on a DC 15 Strength saving throw or have its speed reduced to 0 until the start of its next turn.

Powerful Build. The Crimson Tank counts as one size larger when determining its carrying capacity and the weight it can push, drag, or lift.

Groveltharsh. When you hit with an attack using this longsword, you can deal an extra 2d6 bludgeoning damage to the target. If you do, you take 1d6 psychic damage. This longsword deals double damage to objects and structures.

Multiattack. The Crimson Tank makes two attacks with Grovelthrash.

Grovelthrash. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 21 (1d8 + 1d4 + 13) slashing damage.

Dark Aegis. The Crimson Tank adds 6 to its AC against one melee attack that would hit it. To do so, the Crimson Tank must see the attacker and be wielding a melee weapon.

Groveltharsh Retribution(1/day). When a creature you can see within 30 feet of you hits you with an attack, you can use your reaction to deal an amount of psychic damage to that creature equal to the damage you took from the attack.