A giant, ancient skeletal king with a glowing crown, residing in the plains or open areas.

Death Burst. The skeleton explodes when it dies. Dexterity Saving Throw: DC 12, each creature in a 10-foot Emanation originating from the skeleton. Failure: 14 (4d6) Fire damage. Success: Half damage.

Illumination. The skeleton sheds bright light in a 15-foot radius and dim light for an additional 15 feet.

If set on fire or attacked by fire, Yagluth gains advantage on its next turn. If the fire is put out before its turn or its turn ends, it loses advantage.

-Meteor Swarm. Blazing orbs of fire plummet to the ground at four different points you can see within range. Each creature in a 40-foot-radius sphere centered on each of those points makes a Dexterity saving throw. A creature takes 20d6 Fire damage and 20d6 Bludgeoning damage on a failed save or half as much damage on a successful one. A creature in the area of more than one fiery Sphere is affected only once.

A nonmagical object that isn’t being worn or carried also takes the damage if it’s in the spell’s area, and the object starts burning if it’s flammable.

-Slam. Melee Attack Roll: +6, reach 5 ft. Hit: 15 (2d10 + 4) Bludgeoning damage.