Gargantuan (Aberration (Psionic)) CR 15
HP 312, hd25d8+200 AC 28 (?4 size, ?2 Dex, +24 natural), touch 4, flat-fooded 28 Fort +16, Ref +6, Will +16 Speed 20 ft. (4 squares) Initiative +2 Spot , Listen
Standard attacks BAB +18, Grapple +40
Attacks
Full attack: 4 tentacle rakes +24 melee (2d6+10/19?20)
Special Attacks/Qualities
Breath weapon, improved grab, psi-like abilities, swallow whole
Blindsight 100 ft., damage reduction 5/?, power resistance 25
Skills Climb +38, Knowledge (psionics) +31, Listen +30, Psicraft +31, Spot +30
Feats Cleave, Improved Critical (tentacle rake), Improved Initiative, Power Attack, Psionic Endowment, Psionic Fist, Psionic Meditation, Speed of Thought, Wild Talent
Str 30 Con 27 Dex 7 Int 16 Wis 15 Cha 20
Alignment Always lawful evil, Environment Underground, Organisation Solitary

A mature neothelid is a gigantic worm scores of feet long and weighing tens of thousands of pounds. Although they understand Undercommon, they rarely communicate in a meaningful way.

Breath Weapon (Su): Cone of acid 50 feet long, once every 1d4 rounds; damage 14d10 acid, Reflex half DC 30.
Improved Grab (Ex): To use this ability, a neothelid must hit a creature with two tentacles during the same attack. If it gets a hold, it automatically deals tentacle damage and can attempt to swallow the foe.
Psi-Like Abilities: At will?body equilibrium, psionic charm (all targets, duration 15 days, DC 21*), clairvoyant sense, psionic levitate, read thoughts (DC 17*), psionic suggestion (seven targets, DC 17*), telekinetic force (500 lb., DC 18*), telekinetic maneuver (+4 bonus, DC 19*), telekinetic thrust (500 lb., DC 18*), psionic teleport, trace teleport, truevenom (DC 19); 3/day?mind thrust (15d10, DC 23*), psychic thrust (6d6, DC 16**). Manifester level 15th. The save DCs are Charisma-based.
*Includes augmentation for the neothelid?s manifester level.
**Includes the inherent +4 save adjustment described in the power.
Swallow Whole (Ex): A neothelid can try to swallow a grabbed opponent of a smaller size than itself by making a successful grapple check. Once inside, the opponent takes 2d8+15 points of crushing damage plus 2d6 points of acid damage per round from stomach secretions. A swallowed creature can cut its way out by using a light slashing or piercing weapon to deal 25 points of damage to the stomach (AC 22). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out. A neothelid?s interior can hold 1 Huge, 2 Large, 8 Medium, 32 Small, 128 Tiny, or 512 Diminutive or smaller opponents.
Blindsight (Ex): A neothelid can use nonvisual means to ascertain all foes within 100 feet as a sighted creature would.

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System Reference Document -> List of Creatures (SRD)