Large (Animal (Aquatic)) CR 8
HP 47, hd8d8+11 AC 18 (?1 size, +2 Dex, +7 natural), touch 11, flat-fooded 16 Fort +7, Ref +8, Will +3 Speed 20 ft. (4 squares), swim 30 ft. Initiative +2 Spot , Listen
Standard attacks BAB +6, Grapple +15
Attacks
Full attack: 8 tentacles +10 melee (1d4+5) and bite +5 melee (1d8+2)
Special Attacks/Qualities
Improved grab, constrict
Ink cloud, jet, low-light vision
Skills Escape Artist +12, Hide +12, Listen +4, Spot +6, Swim +13
Feats Alertness, Skill Focus (Hide), Toughness
Str 20 Con 13 Dex 15 Int 2 Wis 12 Cha 3
Alignment Always neutral, Environment Warm aquatic, Organisation Solitary

These creatures are aggressive and territorial hunters, with arms reaching 10 feet or more in length. Their tentacles are studded with barbs and sharp-edged suckers.

An opponent can attack a giant octopus?s tentacles with a sunder attempt as if they were weapons. A giant octopus?s tentacles have 10 hit points each. If a giant octopus 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 octopus?s tentacles deals 5 points of damage to the creature. A giant octopus usually withdraws from combat if it loses four tentacles. The creature regrows severed limbs in 1d10+10 days.
Constrict (Ex): A giant octopus deals 2d8+6 points of damage with a successful grapple check.
Improved Grab (Ex): To use this ability, a giant octopus must hit an opponent of any size with a tentacle attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can constrict.
Ink Cloud (Ex): A giant octopus can emit a cloud of jet-black ink 20 feet high by 20 feet wide by 20 feet long once per minute as a free action. The cloud provides total concealment, which the octopus normally uses to escape a losing fight. All vision within the cloud is obscured.
Jet (Ex): A giant octopus can jet backward once per round as a full-round action, at a speed of 200 feet. It must move in a straight line, but does not provoke attacks of opportunity while jetting.
Skills: A giant octopus can change colors, giving it a +4 racial bonus on Hide checks. A giant octopus also can squeeze and contort its body, giving it a +10 racial bonus on Escape Artist checks. A giant octopus has a +8 racial bonus on any Swim check to perform some special action or avoid a hazard. It can always choose to take 10 on a Swim check, even if distracted or endangered. It can use the run action while swimming, provided it swims in a straight line.
SEE WIKIPEDIA ENTRY: Octopus

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System Reference Document -> List of Creatures (SRD)