Regeneration (Slaad Only). The spirit regains 5 Hit Points at the start of its turn if it has at least 1 Hit Point.
Whispering Aura (Mind Flayer Only). At the start of each of the spirit's turns, the spirit emits psionic energy if it doesn't have the Incapacitated condition. Wisdom Saving Throw: DC equals your spell save DC, each creature (other than you) within 5 feet of the spirit. Failure: 2d6 Psychic damage.
Multiattack. The spirit makes a number of attacks equal to half this spell's level (round down).
Claw (Slaad Only). Melee Attack Roll: Bonus equals your spell attack modifier, reach 5 ft. Hit: 1d10 + 3 + the spell's level Slashing damage, and the target can't regain Hit Points until the start of the spirit's next turn.
Eye Ray (Beholderkin Only). Ranged Attack Roll: Bonus equals your spell attack modifier, range 150 ft. Hit: 1d8 + 3 + the spell's level Psychic damage.
Psychic Slam (Mind Flayer Only). Melee Attack Roll: Bonus equals your spell attack modifier, reach 5 ft. Hit: 1d8 + 3 + the spell's level Psychic damage.