Giant Nautilus
Gargantuan Magical Beast (Extraplanar, Water)
Hit Dice: 14d10+140 (217 hp)
Initiative: -1
Speed: Swim 50 ft (10 squares)
Armor Class: 23 (-4 size, -1 Dex, +18 natural), touch 5, flat-footed 23
Base Attack/Grapple: +14/+40
Attack: tentacle
Full Attack: 20 tentacles +24 melee (1d8+14) and bite +19 melee (5d4+7)
Space/Reach: 20 ft/15 ft
Special Attacks: Constrict, improved grab, spell-like abilities, squeeze hull, swallow whole
Special Qualities: Darkvision 60 ft, low-light vision, spell resistance 13, telepathy X ft
Saves: Fort +19, Ref +8, Will +10
Abilities: Str 38, Dex 9, Con 31, Int 18, Wis 22, Cha 20
Skills: 102
Feats: 5
Environment: Elemental Plane of Water
Organization: Solitary
Challenge Rating: X
Treasure: None
Alignment: Usually neutral
Advancement: 15-28 HD (Gargantuan); 29-42 HD (Huge)
Level Adjustment: ---
COMBAT
An opponent can attack a giant nautilus's tentacles with a sunder attempt as if they were weapons. A giant nautilus's tentacles have 15 hit points each. If a giant nautilus is currently grappling a target with the tentacle that is being attacked, it usually uses another limb to make its attack of opportunity against the opponent making the sunder attempt. Severing one of a giant nautilus's tentacles deals 7 points of damage to the creature. A giant nautilus usually withdraws from combat if it loses (10? 12?) tentacles. The creature regrows severed limbs in (7) days.