Multiattack

Alluring Whispers then three Spines or Psychic Lash attacks.

Spines

Melee or Ranged Weapon Attack: +8 to hit 5 ft. or range 20/60' one target 16 (4d6+2) piercing damage and if the target is a Humanoid it must make DC 19 Con save or contract the thrall sickness disease (see the Thrall Sickness trait).

Psychic Lash

Ranged Spell Attack: +11 to hit, 120 ft., one target, 18 (3d8+5) psychic.

Alluring Whispers

The sinstar telepathically whispers soothing and beckoning words in the minds of all Humanoids within 120' of it. Each target must make DC 19 Wis save or be charmed for 1 min. While charmed a creature is incapacitated and if it is more than 5 ft. away from the sinstar it must move on its turn toward the sinstar by the most direct route trying to get within 5 ft. of the sinstar and touch it. The creature doesn't avoid opportunity attacks but before moving into damaging terrain such as lava or a pit and whenever it takes damage from a source other than the sinstar the creature can repeat the save. A charmed creature can also re-save at end of each of its turns. If the save is successful the effect ends on it. A creature that successfully saves is immune to this sinstar's Alluring Whispers for the next 24 hrs.