Armor Class 14
Hit Points 54 (12d4 + 24)
Speed 40 ft.
Damage Resistances psychic
Condition Immunities blinded
Senses blindsight 30 ft. (can't see beyond this radius), passive Perception 11
Languages —
Challenge 3
Encephalon Progeny. The gemmule matures into an encephalon cluster if not killed within 30 (4d12 + 4) days of its creation.
Magic Resistance. The gemmule has advantage on saving throws against spells and other magical effects.
Psychic Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 16 (3d10) psychic damage.
Leech. The gemmule targets one creature within 5 feet of itself and forces the target to make a DC 14 Dexterity saving throw. On a failed save, the gemmule enters the target's space and attaches to the target. While the gemmule is attached, the target takes 7 (3d4) piercing damage at the start of each of its turns, and the gemmule can't use Leech again until it detaches. It can detach itself by spending 5 feet of its movement. As an action, the target or a creature within 5 feet of the target can detach the gemmule by succeeding on a DC 15 Strength check.
PaBTSO, p. 206