Invincible. Xiuteca is unaffected by lightning. Any attacks made against his back rebound on the attacker, doing their normal damage.

Luck. Xiuteca always rolls saving throw with advantage, no matter the circumstances.

Undeath. Regenerate 30 HP per turn, even if killed, until a ritual is completed.

Brutal Macuahuitl. This tribal sword’s sturdy wooden frame is lined with feathersteel shards, allowing attacks made with it to deal either bludgeoning or slashing damage (your choice). In addition, the sword has been enchanted through numerous blood rituals by war priests. When you roll a 20 on your attack roll with this magic weapon against a creature, that creature becomes marked for death until the start of your next turn. A marked creature can’t regain hit points, and when the mark ends, that creature takes 1d8 necrotic damage.

Lifes Sunder. Melee Weapon Attack: +16 to hit; one target. Hit: 11 (1d10 +6). A creature hits by the claw must roll a DC 18 constitution saving throw or lose 1 constitution point permanently. The loss cannot be removed but by spells like wish or miracle.

Bear Hug. The avatar retains the bear’s ability to hug its victims for 2d4 +7 additional damage on a to hit roll of 18 or better with its claws.

Boundless leap. As a reaction to an attack xiuteca can leap 120ft straight up to escape danger

Godsfall. Plummet from the sky turning into a flaming ball of fire. Hit the ground doing 56 damage to anyone in a 40ft radius of impact

The cycle interupted.  xiuthan grapples a target lifted them off the ground then sends a coursing wave of death through the target for 10d6 Necrotic damage. If target is brought down to 0 hp the target cannot make death saves and can only be revived with a wish spell.