Colossal Stone Champion

Legendary Resistance (5/Day). If the Colossal Stone Champion fails a saving throw, it can choose to succeed instead.

Immutable Form. The Colossal Stone Champion is immune to any spell or effect that would alter its form. 

Colossal Size: The Colossal Stone Champion is colossal, it ocupies a 50ft wide 50ft long 170ft tall space.

Mind Control Imunity; The Colossal Stone Champion is immune to effects that would force it to act agaisnt its established program (will).

Magic Resistance. The Colossal Stone Champion is immune to spells cast with spell slots of 6th level or lower and has advantage on saving throws against spells and other magical effects.

Weak Balance: The Colossal Stone Champion impressive size is its most powerful asset however it is also its most glaring weakness, it must use its full action to stand up from the prone condition. (You may make the Colossal Stone Champion imune to the prone condition falling only when it dies.)

Fall of the Colossus: When the Colossal Stone Champion falls to 0 hit points, all creatures and structures within 120ft of the Colossal Stone Guardian must succeed in a DC 27 Dexterity saving throw taking 14d12 bludgeoning damage being pushed back 20ft and falling prone on a failure, half damage on a success and no additional effects. points.)

Seige Monster: The Colossal Stone Champion deals double damage to structures.

Magic Weapons. The Colossal Stone Champion´s weapon attacks are magical.

Moving Mountain: The Colossal Stone Champion is immune to any speed reduction other than from spells cast with spell slots of 9th level or higher.

Immeasurable Weight: The Colossal Stone Champion is massivly heavy and not particulary agile, it cannot swim nor jump or use the dash action, however it can walk normaly across the ground of bodies of water or other liquids, additionaly it cannot be moved agaisnt its will other than from spells cast with spell slots of 9th level or higher.

Colossus Fortitude The Colossal Stone Champion only takes damage if the attack deals 25 damage or more (calculated after resistances).

Colossal Grasp:All creatures within a 10ft cube within 35ft of the Colossal Stone Champion must succeed in a DC 20 Dexterity saving throw, on a failure they take 14d10+12 bludgeoning damage and are restrained by the hand of the Colossal Stone Champion, a creature can as an action atempt to succeed in a DC 26 Strenght saving throw to escape the restraining hand, tiny and gargantuan creatures cannot be restrain by the Colossus graps, however they still take damage.
All creatures hit by the attack that can be restrained by it and are within the targeted area are restrained in one of the Colossal Stone Champion´s hands.
The Colossal Stone Champion can only perform this attack if it has at least one free hand.

Colossal Sword: All Creatures within a 60ft long 30ft wide cone starting on the Colossal Stone Champion, must succeed in a DC 26 Dexterity saving throw, being pushed 30ft in the away from the Colossal Stone Champion taking 18d12+12 bludgeoning damage on a failure.
All structures destroyed by this attack are pushed away leaving the affected area empty and without places for half, or full cover.

Colossal Stomp: All Creatures within 60ft of the Colossal Stone Champion must succeed in a DC 20 Dexterity saving throw taking 8d12+8 thunder damage + 8d12+8 bludgeonig damage and falling prone on a failure half as much damage on a success and no additonal effects.

Smash Ant: Melee Weapon Attack; +20 to hit, 40ft range, one target, 8d12+8 Bludgeoning damage, a creature large or smaller hit by this attack falls prone and has their bones crushed with their speed reduced by half until it heals at least 10hp, creatures with no bones or otherwise unphased by broken bones are immune to this effect.
The Colossal Stone Champion can only perform this attack if it has at least one free hand.

Crushing Grasp: As a bonus action the Colossal Stone Champion can crush whatever creatures restrained by its Colossal Grasp, all restrained creatures take 8d12+8 bludgeonig damage,.