Slaver Fungus (CR 10*)

Gargantuan Plant
Alignment: Always neutral
Initiative: -2 (Dex)

AC: 14 (-4 size, -2 Dex, +10 natural), touch 4, flat-footed 14
Hit Dice: 10d8+80 (125 hp)
Fort +15, Ref +1, Will +3
Speed: 0 ft.
Space: 30 ft./40 ft.
Base Attack +7; Grapple +15
Attack: 4 tendrils +11 melee
Full Attack: 4 tendrils +11 melee
Damage: Tendril 2d8+8
Special Attacks/Actions: Fungus minions, improved grab, transforming fungus
Abilities: Str 26, Dex 7, Con 26, Int 3, Wis 10, Cha 3
Special Qualities: Fire vulnerability, plant traits, tendril regeneration
Advancement: 11-17 HD (Gargantuan); 18-28 HD (Colossal)
Climate/Terrain: Any forest
Organization: Solitary
Treasure: 1/10 coins; 50% goods; 50% items

Source: Web

*This number can be adjusted up or down depending on how many fungus minions the slaver fungus controls.

The main body of a slaver fungus looks like an enormous purplish-white mushroom with a very broad cap. The outer layer of the fungus is extremely tough, like the bark of a tree. Immediately beneath the cap are four large nodules that form the base of long, thin, tough tendrils. These tendrils extend into the underbrush, where they seek out and grapple prey.

The most insidious aspect of the slaver fungus is its ability to infect living creatures and transform them into walking plants that protect the main body. A fully-grown fungus constantly releases spores that blanket the area around it. These spores infect any creature that breathes them in, creating fungus minions: zombies animated not by negative energy, but the fungus that pervades their bodies.

Externally, fungus minions look as they did in life, but a dense, sickly, purplish-green fungus covers their skin and fills their eye sockets. They wear the tattered remains of any armor and clothing on their person at the time of death; it, too, is densely covered with fungus (and offers no additional protection). Internally, the fungus quickly moves through the victim's body, consuming tissue at a rapid rate until only an animated shell remains.

Animals of the forest are also commonly infected, shambling around alongside humanoid fungus minions.