Guardian Naga

If it dies, the naga returns to life in 1d6 days and regains all its hit points. Only a wish spell can prevent this trait from functioning.

The naga is an 11th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 16, +8 to hit with spell attacks), and it needs only verbal components to cast its spells. It has the following cleric spells prepared:

Cantrips (at will): mending, sacred flame, thaumaturgy

Level 1 (4 slots): command, cure wounds, shield of faith

Level 2 (3 slots): calm emotions, hold person

Level 3 (3 slots): bestow curse, clairvoyance

Level 4 (3 slots): banishment, freedom of movement

Level 5 (2 slots): flame strike, geas

Level 6 (1 slots): true seeing

Melee Weapon Attack: +8 to hit, reach 10 ft., one creature. Hit: 8 (1d8 + 4) piercing damage, and the target must make a DC 15 Constitution saving throw, taking 45 (10d8) poison damage on a failed save, or half as much damage on a successful one.

Ranged Weapon Attack: +8 to hit, range 15/30 ft., one creature. Hit: The target must make a DC 15 Constitution saving throw, taking 45 (10d8) poison damage on a failed save, or half as much damage on a successful one.