Gray Fungus (CR 5)

Medium Plant
Alignment: Always neutral
Initiative: +5; Senses: low-light vision, Listen +8, and Spot +8
Languages: Telepathy 30 ft.

AC: 15 (+1 Dex, +4 natural), touch 11, flat-footed 14
Hit Dice: 4d8+15 (33 hp); DR: 3/-
Fort +7, Ref +2, Will +2
Speed: 10 ft.
Space: 5 ft./10 ft.
Base Attack +3; Grapple +5
Attack: Tentacle +5 melee
Full Attack: 4 tentacles +5 melee
Damage: Tentacles 1d4+2 plus poison
Special Attacks/Actions: Control plants, poison, psychic shriek
Abilities: Str 14, Dex 12, Con 16, Int 15, Wis 13, Cha 15
Special Qualities: plant traits
Feats: Improved Initiative; Toughness
Skills: Hide +8, Listen +8, Move Silently +8, and Spot +8
Advancement: 5-8 HD (Medium); 9-12 HD (Large)
Climate/Terrain: Underground
Organization: Solitary, pair, patch (3-4), or mixed patch (2-4 gray fungi, 2-4 violet fungi and 3-5 shriekers)
Treasure: None

Source: Web

The odd-looking, gray mushroom is as tall as a human and has an oval cap that vaguely resembles a brain. Four tendril-like tentacles ring its upper body, and a mass of small, rootlike feelers at its base serves as a means of locomotion.

The gray fungus is a subterranean predator that prefers to hunt living prey, though it eats carrion when no other food is available. Though slow moving, it is quite stealthy and can temporarily disable its prey with a mental shriek.

A gray fungus looks like a 5-foot-tall mushroom with a 3-foot-wide cap and a stem about a foot and half thick. It weighs about 100 pounds and can move via a mass of tiny tentacles at its base.

Although it has no vocal apparatus, a gray fungus understands Undercommon. Via its telepathy ability, it can mentally communicate with any creature that has an Intelligence score.