Immutable Form. Coglarian is immune to any spell or effect that would alter its form.
Epitome of Order. Attacks rolls made against Coglarian cannot benefit from advantage.
Law of Averages (3/Day). When Coglarian makes an attack roll, an ability check, or a saving throw, it can automatically roll a 10 on the d20.
Legendary Resistance (3/Day). If Coglarian fails a saving throw, it can choose to succeed instead.
Magic Weapons. Coglarian's weapon attacks are magical.
Multiattack. Coglarian makes two arm blade attacks, or two revolving revolver attacks.
Arm Blade. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 27 (5d8 + 5) slashing damage.
Revolving Revolver. Ranged Weapon Attack: +8 to hit, range 120 ft., one target. Hit: 16 (3d10 + 2) damage. Choose acid, cold, fire, lightning, poison, or thunder.
Unerring Correction. Ranged Spell Attack: automatic hit, range 60 ft., one target. Hit: 18 (2d10 + 7) force damage, and a target of any non-lawful alignment must succeed on a DC 19 Charisma saving throw or take 15 (6d6) psychic damage and lose any resistances they possess until the end of Coglarian's next turn.
Unerring Corruption. Ranged Spell Attack: automatic hit, range 60 ft., one target. Hit: 18 (2d10 + 7) force damage, and a target of any non-evil alignment must succeed on a DC 19 Charisma saving throw or take 15 (6d6) psychic damage and must make a weapon or spell attack against an enemy of Coglarian's that it chooses.
Shrapnel Blast (Recharge 5-6). Coglarian jettisons a spray of jagged metal in a 30-foot cone. Each creature in the area must make a DC 19 Dexterity saving throw, taking 44 (8d10) piercing damage on a failed save, or half as much damage on a successful one.
Averaging Abjuration. When another creature successfully hits Coglarian with an attack roll, it can use its reaction to substitute the number rolled with a 10.
Coglarian can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Coglarian regains spent legendary actions at the start of its turn.
Repair. Coglarian restores 44 (8d10) hit points to itself.
Dire Correction (Costs 2 Actions). Coglarian uses its Unerring Correction attack.
Dire Corruption (Costs 2 Actions). Coglarian uses its Unerring Corruption attack.
Description
Coglarian is a dangerous fiend of unknown origin. The few legends that exist around this creature, claim that it was originally a construct hailing from Mechanus, and was banished to the Abyss for its sinister behavior. Coglarian slowly made its way out of the Abyss and into the Underdark, where it found the duergar, the deep gnomes and a clan of scientists working together to create a home for themselves in the creeping darkness. The clan's fondness for construction and mechanical machinations proved to be their undoing as they mistook the fiend as some sort of clockwork god.
Coglarian commanded the clan to craft an army of creatures it could use to wage war on the Underdark, intending to transform the land into its own lair of the Abyss. Coglarian's most crucial key to dominance of the Underdark was a new body, a mechanical construct that it could use to become essentially unstoppable. As the fiend grew more demanding and unruly, the clan realized their mistake in trusting it and one member of the clan, Eldison Evrin, stole the nearly completed Vessel of Coglarian and fled to a dwarven stronghold at the edge of the Underdark.
Evrin, hid in the city known as Mindor for decades, beginning his own family and raising a son, but unintentionally starting a war between the dwarven city and Coglarian's forces, who needed to retrieve the vessel for Coglarian. During the peak of the war, an artificer from Embirth, Moira Ironcast, found her way to Mindor and managed to reprogram the Vessel of Coglarian to fight on the side of the dwarves, giving them the advantage they needed to finally end the war.
Coglarian now forces its unwilling followers to craft a larger and more formidable vessel that will allow it to crush the resistance of every hold out in the Underdark, beginning with the city of Mindor, and the small band of warriors who continue to harbor Coglarian's original vessel.
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