Corrupted Corinthian Column

Immutable Form. The Column is immune to any magic that might change its form, shape, or size.

Magical Resistance. The Column has advantage on saving throws against spells and other magical effects.

Stoneskin. The Column has resistance to slashing or piercing damage from any non-magical weapon. Additionally, any critical hit scored with a non-magical weapon causes the weapon to shatter once the damage score is resolved.  This does not affect unarmed attacks. Nonmagical ammunitions that hit the column are destroyed as well. 

Incomprehensible. Any creature that spends an action to look at or study the column must then succeed on a DC 15 Constitution saving throw or become stunned until the end of their next turn. 

Cutting Losses. When the column's hit points fall beneath 1/3 of their maximum, the capital separates from the fluted section and falls to the ground. The fluted section becomes unmoving as stone, while the capital unfurls its leaves to become a collection of smaller legs that allow it a movement speed of 25ft.

Charge. If the capital moves at least 15 feet straight toward a target and then hits it with a ram attack on the same turn, the target takes an extra 4 (1d6) [bludgeoning] damage. If the target is a creature, it must succeed on a DC 12 Strength saving throw or be knocked prone.

Stomp. The column used its length like a massive single leg to leap into the air and then stomp down on an enemy within 10 feet of it's starting point. Any creature that previously occupied the spaces now occupied by the column must succeed on a DC 12 saving throw or take (2d8) bludgeoning damage and be knocked prone and pushed away into an adjacent square. Any non-magical items in the previously occupied spaces now occupied by the column are immediately destroyed. The column must recoil itself again before it may make another stomp attack. (Cannot be made once the capital is separated from the column base)

Swing Melee Attack. Melee Weapon Attack: +4 to hit, reach 15 ft., up to 4 targets. Hit: 8 (1d8 + 4) [bludgeoning] damage. The column may not make a swing attack and a recoil in the same round. (Cannot be made once the capital is separated from the column base)

Ram Attack. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 8 (1d8 + 4) [bludgeoning] damage. (Cannot be made until after the capital is separated from the column base)

Recoil. The column bends itself in readiness to spring, like an enormous leg. It may not recoil in the same round that it makes a swing attack. (Cannot be made once the capital is separated from the column base)

Twisting Realignment. The column can use a bonus action to spin or twist sections of itself, to align undamaged sections or reposition its eyes, without moving its foot. (Cannot be made once the capital is separated from the column base)