Large Celestial, Lawful Good
Armor Class 18 Initiative +4 (14) Hit Points 136 (16d10 + 48) Speed 40 ft., Climb 40 ft., Swim 40 ft.
Saving Throws Str +4, Dex +8, Con +7, Int +7, Wis +8, Cha +8
Skills Arcana +11, History +11, Religion +11
Damage Immunities Poison; Charmed, Paralyzed, Poisoned, Restrained
Senses Darkvision 60 ft.; Passive Perception 14
Languages Celestial, Common
Challenge Rating 10
If the naga dies, it returns to life in 1d6 days and regains all its Hit Points unless Dispel Evil and Good is cast on its remains.
The naga makes two Bite attacks. It can replace any attack with a use of Poisonous Spittle.
Melee Attack Roll: +8, reach 10 ft. Hit: 17 (2d12 + 4) Piercing damage plus 22 (4d10) Poison damage.
Constitution Saving Throw: DC 16, one creature the naga can see within 60 feet. Failure: 31 (7d8) Poison damage, and the target has the Blinded condition until the start of the naga's next turn. Success: Half damage only.
The naga casts one of the following spells, requiring no Somatic or Material components and using Wisdom as the spellcasting ability (spell save DC 16):
At Will: Thaumaturgy
1/Day Each: Clairvoyance, Cure Wounds (level 6 version), Flame Strike (level 6 version), Geas, True Seeing