Chief Kartha-Kaya

Chief Kartha-Kaya attempts to magically possess a humanoid or giant. Chief Kartha-Kaya must touch the target throughout a short rest, or the attempt fails. At the end of the rest, the target must succeed on a DC 12 Constitution saving throw or be possessed by Chief Kartha-Kaya, which disappears with everything it is carrying and wearing. Until the possession ends, the target is Incapacitated, loses control of its body, and is unaware of its surroundings. Chief Kartha-Kaya now controls the body and can't be targeted by any attack, spell, or other effect, and it retains its alignment; its Intelligence, Wisdom, and Charisma scores; and its proficiencies. It otherwise uses the target's statistics, except the target's knowledge, class features, feats, and proficiencies.
The possession lasts until either the body drops to 0 hit points, Chief Kartha-Kaya ends the possession as an action, or Chief Kartha-Kaya is forced out of the body by an effect such as the Dispel Evil And Good spell. When the possession ends, Chief Kartha-Kaya reappears in an unoccupied space within 5 feet of the body and is Stunned until the end of its next turn. If the host body dies while it is possessed by Chief Kartha-Kaya, Chief Kartha-Kaya dies as well, and its body doesn't reappear.

Chief Kartha-Kaya makes two attacks, either with his flame tongue greatsword or his longbow.

Melee Weapon Attack +6 to hit, reach 5 ft., one target. 18 (4d6 + 4) Slashing damage plus 7 (2d6) Fire damage.

Ranged Weapon Attack +2 to hit, range 150/600 ft., one target. 9 (2d8) Piercing damage.