Chrysos, Hoardfather

Legendary Resistance (3/Day). If Chrysos fails a saving throw, he can choose to succeed instead.

Hurtfull Charity. Whenever a creature is healed by another creature within sight of Chrysos, he takes half the amount healed in force damage. 

Shed Charity (Mythic Trait; Recharges after a Short or Long Rest). If Chrysos is reduced to 0 hit points, he doesn’t die or fall unconscious. Instead, he sheds any ounce of charity in him, regains 275 hit points, and pushes every creature 10ft away from him. He also regains any expended uses of his legendary resistance trait. 

Multiattack. Chrysos makes three Rend attacks. It can replace one of its attacks with Draining Breath, if available. 

Rend. Melee Attack Roll: +14, reach 10 ft. Hit: 17 (2d8 + 8) Slashing damage plus 4 (1d8) Fire damage.

Fire Breath (Recharge 5–6).Dexterity Saving Throw: DC 21, each creature in a 60-foot Cone. Failure: 66 (12d10) Fire damage. Success: Half damage.

Draining Breath(Recharge 6). Strength Saving Throw: DC 21, each creature in a 60-foot Cone. Failure: The target loses (1d6) from one of its stats. Roll (1d6) to determine which one. The target also takes (6d8) necrotic damage. The target dies if this reduces its Strength or Constitution to 0. Otherwise, the reduction lasts until the target finishes a short or long rest.

Chrysos can take up to two reactions per round but only one per turn. 

Greedy recovery. Trigger: A creature heals itself while in sight. Response: Chrysos heals the same amount. Any healing that would go over it's maximum hit points is transformed into temporary hit points. 

Legendary Action Uses: 3 (4 while his mythic trait is active). 

Banish (Costs 2 Actions). Charisma Saving Throw: DC 21, one creature the dragon can see within 120 feet. Failure: 10 (3d6) Force damage, and the target has the Incapacitated condition and is transported to a harmless demiplane until the start of the dragon’s next turn, at which point it reappears in an unoccupied space of the dragon’s choice within 120 feet of the dragon. Failure or Success: The dragon can’t take this action again until the start of its next turn.

Pounce (Costs 1 Action). The dragon moves up to half its Speed, and it makes one Rend attack.

If Chrysos' mythic trait is active, he can use the option below as legendary actions for 1 hour after using Shed Charity.

Arcane repossession (Costs 3 Actions). Chrysos drains arcane energy from a spellcaster within 120ft of him that he can see. That spellcaster must expend a minimum of 5 spell slots in any combination. Chrysos can add to his next attack damage xd6 force damage where x is the amount of spell slots expended.