Invisiquids

(no images since they're often... get this... invisible!)

Size/Type: Medium Magical Beast (Aquatic)
Environment: Temperate aquatic
Initiative: +6
Senses: low-light vision Listen +7 Spot +7

Armor Class: 18 (+5 Dex, +3 natural), touch 13, flat-footed 13
Hit Dice: 8d8+4 (42 hp)
Saves: Fort +4, Ref +8, Will +2

Speed: Swim 60 ft. (12 squares)
Attack: Tentacles +6 melee (0)
Full Attack: Tentacles +6 melee (0) and bite -1 melee (1d6+1)
Space/Reach: 5 ft./5 ft.
Base Attack/Grapple: +4/+10*

Feats: Alertness, Endurance
Special Attacks: Improved grab
Special Qualities: Ink cloud, jet, low-light vision, improved invisibility

Abilities: Str 16, Dex 21, Con 11, Int 1, Wis 12, Cha 2
Skills: Listen +7, Spot +7, Swim +10

Organization: Solitary or school (6-11)
Challenge Rating: 4
Advancement: 5-8 HD (Large); 9-14 HD (Huge)
Level Adjustment: —

Invisiquids are transparent squids of the deep waters of the Emerald Sea. They are highly prized by Deep Sea Gnomes for their ink, which renders the wearer invisible.

These magical beasts with the bodies of free-swimming mollusks are very aggressive, and have been known to sneak up and devour humanoids in a single swoop. Those which are not devoured are grappled and squeezed until they fall unconscious. The invisisquid ink turns their victims invisible so they cannot be helped by their companions.

Combat

Improved Grab (Ex): To use this ability, a squid must hit an opponent of any size with its arms 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 automatically deals bite damage. An invisisquid has a +6 racial bonus on grapple checks.

Ink Cloud (Ex): A squid can emit a cloud of jet-black ink 10 feet high by 10 feet wide by 10 feet long once per minute as a free action. The cloud provides total concealment, which the squid normally uses to escape a losing fight. All vision within the cloud is obscured.

Invisibility (Ex): The most defining feature of invisisquids is their ability to turn completely invisible, making them very hard to fight underwater.

Jet (Ex): An invisisquid can jet backward once per round as a full-round action, at a speed of 300 feet. It must move in a straight line, but does not provoke attacks of opportunity while jetting.

Skills

An invisisquid has a +10 racial bonus on any Swim check to perform some special action or avoid any natural 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.