Devil Sail (Sea Nettle) (CR 7)

Large Magical Beast (Aquatic)
Alignment: Neutral
Initiative: +3 (-1 Dex, +4 Improved Initiative); Senses: darkvision 60 ft., low-light vision, underwater sense, Listen +9, and Spot +13

AC: 8 (-1 size, -1 Dex), touch 8, flat-footed 9
Hit Dice: 9d10+36 (85 hp)
Fort +10, Ref +5, Will +2
Speed: Swim 20 ft.
Space: 10 ft./20 ft.
Base Attack +9; Grapple +8
Attack: Touch +12 melee touch
Full Attack: Touch +12 melee touch
Damage: Touch paralysis
Special Attacks/Actions: Improved grab, paralytic touch, psionics
Abilities: Str 19, Dex 8, Con 19, Int 8, Wis 9, Cha 8
Special Qualities:
Feats: Alertness; Improved Initiative
Skills: Listen +9, Spot +13, and Swim +15
Advancement: 10-17 HD (Large), 18-36 HD (Huge)
Climate/Terrain: Any aquatic
Organization: Solitary
Treasure/Possessions: None

Source: Web

Improved Grab (Ex): If a devil sail hits an opponent that is at least one size category smaller than itself with a touch attack, it attempts to start a grapple as a free action without provoking an attack of opportunity (grapple bonus +17). If it gets a hold, it has the option to conduct the grapple normally, or simply use its tendrils to hold the opponent (-20 penalty on grapple check, but the devil sail is not considered grappled). Each successful grapple check it makes during successive rounds automatically has a chance to paralyze the opponent.

Paralytic Touch (Ex): The devil sail's tendrils have a caustic, paralyzing touch. When the tendril makes a successful touch or grab attack, it causes 1d10 points of acid damage. It also causes 2d4 points of temporary Dexterity damage unless a Fortitude save (DC 18) is made. Even after the death of a devil sail, the tendrils remain caustic for up to 4 weeks and often harm innocent swimmers or beachcombers.

Psionics (Sp): 3/day -- dimension slide, painful touch. Effective manifester level 11th.

Attack/Defense Modes (Sp): At will -- ego whip/empty mind, thought shield, mental barrier.

Underwater Sense (Ex): A devil sail can locate creatures underwater within a 60-foot radius. This ability negates the effects of invisibility and poor visibility. It is less effective against creatures without central nervous systems, such as undead, oozes, and constructs; a devil sail can locate such creatures only within a 30-foot radius. Devil sails are not fooled by figments when underwater.

The devil sail follows water currents and wind patterns in search of prey. When it senses something of Small to Large size, it moves to attack the target.

Aquatic Subtype

Creatures with the aquatic subtype always have swim speeds and thus can move in water without making Swim checks. An aquatic creature can breathe underwater. It cannot also breathe air unless it has the amphibious special quality.