• Irresistible Charm. A Synapsid’s charm effects bypass immunity. Creatures normally immune to being charmed (such as elves, fey, or celestials) instead make saving throws against these effects with advantage.

• Feytouched Mind. The Synapsid cannot be controlled by an Elder Brain or forced into a hive mind.

• Psionic Elegance. The Synapsid adds its Charisma modifier to its AC while unarmored.

• Spellcasting. The Synapsid is a 7th-level spellcaster. Its spellcasting ability is Charisma . It knows the following spells:

• Cantrips (at will): friends, vicious mockery, dancing lights
  1st level (4 slots): charm person, dissonant whispers, sleep
  2nd level (3 slots): calm emotions, enthrall, suggestion
  3rd level (3 slots): hypnotic pattern, major image
  4th level (1 slot): compulsion, greater invisibility

Multiattack. The Synapsid makes two tentacle attacks or casts one spell and makes one tentacle attack.

Tentacle. Melee Weapon Attack: +6 to hit, reach 10 ft., one target.
Hit: 13 (2d8+4) psychic damage, and the target must succeed on a DC 16 Charisma saving throw or be charmed for 1 minute. While charmed, the creature regards the Synapsid as a trusted ally. The save repeats at the end of each of its turns.

Spellcasting. The Synapsid casts a spell (see spell list).

Psionic Allure (Recharge 5–6). The Synapsid radiates alien beauty. Each creature of its choice within 30 ft. must succeed on a DC 16 Wisdom saving throw or be charmed for 1 minute. This effect bypasses charm immunity (though immune creatures roll with advantage). Charmed creatures retain identity but fight on the Synapsid’s behalf.