Mosslord (CR 16)

Large Plant
Alignment: Always chaotic neutral
Initiative: +1 (Dex); Senses: low-light vision, Listen +27, and Spot +27
Languages: Understand Common and Sylvan, telepathy 100 ft.

AC: 29 (-1 size, +1 Dex, +19 natural), touch 10, flat-footed 28
Hit Dice: 20d8+180 (270 hp); DR: 15/magic and slashing
Fort +21, Ref +9, Will +12
Speed: 40 ft.
Space: 10 ft./10 ft.
Base Attack +15; Grapple +30
Attack: Tentacle +25 melee
Full Attack: 6 tentacles +25 melee
Damage: tentacle 2d6+11
Special Attacks/Actions: Brainlance, improved grab, mossy transformation
Abilities: Str 33, Dex 12, Con 28, Int 15, Wis 18, Cha 19
Special Qualities: immune to fire, mental reflection, plant traits
Feats: Combat Expertise; Combat Reflexes; Improved Disarm; Improved Trip; Iron Will; Lightning Reflexes; Stealthy
Skills: Escape Artist +24, Hide +22, Jump +15, Listen +27, Move Silently +3, Spot +27, and Use Rope +1 (+3 bindings)
Advancement: 21-25 HD (Large), 26-35 HD (Huge), 36-40 HD (Gargantuan)
Climate/Terrain: Temperate forests
Organization: Solitary or swath (one mosslord plus 1d4+4 shambling mounds)
Treasure: Standard

Source: Web

What at first seemed to be a moss covered deadfall suddenly lurches upright into a vaguely humanoid form, except that instead of a head and arms it merely has a writhing nest of six long, powerful tentacles. Its legs are stocky and splay outward, merging with the surrounding vegetation and uprooting with a nauseating wet rip as it moves.

Some say the first mosslords are the unfortunate result of illithid experiments where they infused surface vegetation with powerful psionic energies. Why the mind flayers would seek to perform such experiments is unclear, although it likely has something to do with their endless pursuit of creating slave races that can exist and operate on the surface. Whatever the original reason, the illithids seem to have cut all contact with these creations, which have since established themselves as powerful menaces in many of the darker forests in the world. Often, increased shambling mound activity is a direct result of the arrival of a new mosslord.

Although they seem like mere plants, the mosslord is in fact a highly intelligent and dangerous predator. It relentlessly stalks all non-plant life in a large reach of woodland and seeks to eradicate all such life or transform it into something more pleasing. A mosslord becomes less aggressive once it has denuded a region of forest several square miles in size of all animal life, and it usually reacts to new intrusions with terrible focus. Rarely, a creature with a close bond to nature (such as a druid or fey) can approach close enough to a mosslord to try to communicate via the mosslord's telepathy. Mosslords sometimes take a liking to such creatures and refrain from attempting to transform them into plants. In fact, they often spend long hours conversing with them on topics that interest plant life.

A mosslord stands 15 feet tall and weighs 3,000 pounds.

Mosslords understand Common and Sylvan, and though they have no vocal apparatus, they can communicate telepathically with any creature that can speak a language.