Assassin Vine (CR 3)

Large Plant
Alignment: Always neutral
Initiative: +0; Senses: blindsight 30 ft. and low-light vision

AC: 15 (-1 size, +6 natural), touch 9, flat-footed 15
Hit Dice: 4d8+12 (30 hp)
Fort +7, Ref +1, Will +2
Speed: 5 ft.
Space: 10 ft./10 ft. (20 ft. with vine)
Base Attack +3; Grapple +12
Attack: Slam +7 melee
Full Attack: Slam +7 melee
Damage: Slam 1d6+7
Special Attacks/Actions: constrict 1d6+7, Entangle, improved grab
Abilities: Str 20, Dex 10, Con 16, Int -, Wis 13, Cha 9
Special Qualities: Camouflage, immunity to electricity, plant traits, resistance to cold 10 and fire 10
Advancement: 5-16 HD (Huge); 17-32 HD (Gargantuan); 33+ HD (Colossal)
Climate/Terrain: Temperate forest
Organization: Solitary or patch (2-4)
Treasure: 1/10th coins; 50% goods, 50% items

Source: Monster Manual

The assassin vine is a semi-mobile plant that collects its own grisly fertilizer by grabbing and crushing animals and depositing the carcasses near its roots.

The mature plant consists of a main vine as thick as a human's forearm and about 20 feet long. Smaller vines up to 5 feet long branch off from the main vine about every 6 inches. These small vines bear clusters of leaves shaped curiously like human hands, and in late summer they produce bunches of small fruits that resemble wild grapes. The woody parts of the vine are coiled and gnarled, covered with brown, stringy bark, making the whole plant resemble a robust grape-vine. The fruit is tough and has a hearty flavor but is widely believed to be poisonous. Assassin vine berries make a heady wine.

A subterranean version of the assassin vine grows near hot springs, volcanic vents, and other sources of thermal energy. These plants have thin, wiry stems and gray leaves shot through with silver, brown, and white veins so that they resemble mineral deposits. An assassin vine growing underground usually generates enough offal to support a thriving colony of mushrooms and other fungi, which spring up around the plant and help conceal it.