Urden'Kai

Bleed: for every 10 points of damage dealt to a target by a single of the Urden'Kai's attacks it will take one stack of bleed (one stack 1d4)(more than one stack of bleed can be given to a target)(every time you take damage from a bleed stack your total stacks is reduced by 1)

Final Stand: When the Urden'Kai's hit points have been reduced to 100HP or fewer it gains access to Mythic actions, and regains all Legendary Resistances, and regains 400HP

Legendary Resistance (3/Day): If the dragon fails a saving throw, it can choose to succeed instead.

Immutable form. Urden'Kai's bodies can not be transformed

Reflective Carapace: Any time the tarrasque is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, roll a d6. On a 1 to 5, the tarrasque is unaffected. On a 6, the tarrasque is unaffected, and the effect is reflected back at the caster as though it originated from the tarrasque, turning the caster into the target.

Primordial Howl (4-6 recharge) (The Urden’Kai roars into the sky causing everyone in a 100 foot radius to make a DC 19 WIS save on a fail they are frightened until they succeed the save at the beginning of each of their turns)

Multiattack (6 attacks actions (AA))

Bite (1 AA) Melee weapon attack +20 reach 10 feet 4d12+12 Piercing damage

Head Smash (6 AA) Melee weapon attack +20 reach 10ft 42d4+72 bludgeoning target must make DC 22 CON save or be stunned until the start of the Urden'Kai's next turn

Double swipe (4 AA)  Melee weapon attack reach 15x10ft +20 (16d6+46) slashing damage

Claw (2 AA) melee weapon attack reach 10ft +20 (8d6+24)

Pounce (3 AA) Melee weapon strike reach leap 60ft the target must make a DC 20 DEX/STR save on a fail they are knocked prone and take 12d6+36 Bludgeoning damage and a success they take half damage and if they are medium or smaller they are knock prone

Tail Swipe (2 AA) Melee Weapon attack reach 25ft +20 8d6+24 slashing on a hit the target is moved 15 feet away from the Urden'Kai and knocked prone

Tail Stab (3 AA) Melee Weapon attack reach 25ft +7 12d6+36 piercing and the target must make a DC 24 CON save or be paralyzed

Spike Throw (1 AA) Ranged weapon attack range 60ft +7 (8d4+12) on a hit the target(s) must make a DC 22 CON save or be paralyzed 

Leap: Jump up to 80ft in any direction

Retaliation: after the Urden'Kai has been attacked while it is not the Urden'Kai's turn it can use a multiattack on the creature that targeted it.

Harden: (recharge 5-6) The Urden'Kai's AC rises by 4 until the start of the Urden'Kai's next turn

The Urden'Kai can take 3 Legendary actions while it is not the Urden'Kai's turn and regains them at the end of it's next turn

Bite Melee weapon attack +20 reach 10 feet 2d12+12 Piercing damage

Head Smash Melee weapon attack +20 reach 10ft 30d4+46 bludgeoning

Double swipe Melee weapon attack reach 15x10ft +20 (14d6+30) slashing damage

Claw melee weapon attack reach 10ft +20 (7d6+12)

Pounce Melee weapon strike reach leap 60ft the target must make a DC 20 DEX/STR save on a fail they are knocked prone and take 20d6+15 Bludgeoning damage and a success they take half damage and if they are medium or smaller they are knock prone

Tail Swipe Melee Weapon attack reach 25ft +20 2d6+12 slashing on a hit the target is moved 15 feet away from the Urden'Kai and knocked prone

Tail Stab Melee Weapon attack reach 25ft +7 20d6+15 piercing and the target must make a DC 24 CON save or be paralyzed

Spike Throw Ranged weapon attack range 60ft +7 (2d4+10) on a hit the target(s) must make a DC 22 CON save or be paralyzed 

Leap: jump 80ft in any direction

If the Urden'Kai enters it's final stand it will gain access to the following actions and can choose one at the beginning of eachof it's turns

Enrage: The Urden'Kai enters a rage until the beginning of it's next turn, While enraged the Urden'Kai always crits and takes half damage from all sources of damage

Invigorate: The Urden'Kai Invigorates until the beginning of it's next turn, while invigorated the Urden'Kai is hasted having an extra action

Wail of the Ages: The Urden'Kai wails into the sky all creatures within 60ft of the Urden'Kai who are not Urden"Kai are considered Incapacitated until the start of the Urden'Kai's next turn