Neothelid

Gargantuan aberration, chaotic evil
Armor Class 16 (natural armor)
Hit Points 325 (21d20 + 105)
Speed 30 ft.
STR
27 (+8)
DEX
7 (-2)
CON
21 (+5)
INT
3 (-4)
WIS
16 (+3)
CHA
12 (+1)
Saving Throws Int +1, Wis +8, Cha +6
Senses blindsight 120 ft., passive Perception 13
Languages
Challenge 13 (10000 XP)
Creature Sense.
Innate Spellcasting (Psionics).
Magic Resistance.
ACTIONS
Tentacles.
Acid Breath (Recharge 5–6).

This full creature's stat block is not available (not OGL).

Volo´s Guide to Monsters
Neothelid