Hundun

Inscrutable. The hundun is immune to any effect that would sense its emotions or read its thoughts, as well as any divination spell that it refuses. Wisdom (Insight) checks made to ascertain the hundun's intentions or sincerity have disadvantage.

Magic Resistance. The hundun has advantage on saving throws against spells and other magical effects.

Radiant Fists. The hundun's Slam attacks are magical. When the hundun hits with a Slam attack, the attack deals an extra 2d6 radiant damage (included in the attack).

Multiattack. The hundun can use its Motivating Babble. It then makes four Slam attacks.

Slam. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 12 (2d6 + 5) bludgeoning damage plus 7 (2d6) radiant damage.

Motivating Babble. The hundun babbles incoherently at one creature it can see within 60 feet of it. The target must succeed on a DC 17 Wisdom saving throw or suffer one of the following effects until the end of its next turn. Roll a d4 to determine which effect happens.

Spellcasting. The hundun casts one of the following spells, requiring no material components and using Wisdom as the spellcasting ability (spell save DC 17): At will: create or destroy water, dancing lights, minor illusion, prestidigitation 3/day each: black tentacles, fabricate (as an action), irresistible dance 1/day each: creation (as an action), plant growth