Strangle Weed (CR 3)

Large Plant (Aquatic)
Alignment: Always neutral
Initiative: +0; Senses: blindsight 30 ft. and Listen +5

AC: 14 (-1 size, +5 natural), touch 9, flat-footed 14
Hit Dice: 4d8+12 (30 hp)
Fort +7, Ref +1, Will +2
Speed: 5 ft.
Space: 10 ft./10 ft. (20 ft. with frond)
Base Attack +3; Grapple +11
Attack: Slam +7 melee
Full Attack: Slam +7 melee
Damage: Slam 1d6+6
Special Attacks/Actions: Constrict 1d6+6, improved grab
Abilities: Str 18, Dex 10, Con 16, Int 2, Wis 12, Cha 6
Special Qualities: camouflage, plant traits, resistance to fire 10
Feats: Power Attack, Weapon Focus (slam)
Skills: Listen +5 and Move Silently +3
Advancement: 5-9 HD (Large); 10-12 HD (Huge)
Climate/Terrain: Temperate and warm aquatic
Organization: Solitary or patch (2-4)
Treasure: 50% coins; 1/10th goods; 1/10th items

Source: Converted

This mass of writhing vines and leaves looks like a large patch of seaweed. Several long fronds protrude from the center of it. The strangle weed is a large, 12-foot wide plant that resembles a patch of seaweed. It attacks by grappling its foe and then squeezing it or drowning it (in the case of air-breathing creatures). Slain creatures are digested by the strangle weed. The strangle weed is dark green and slightly slimy. Three to ten fronds, each about 10 feet long, protrude from its main body, though the strangle weed can easily hide them from potential prey. A subterranean version of the strangle weed is believed to exist, though encounters with it are very rare. It is dark blackish-green and is found in underground pools, stagnant water, and the like.

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.