Notes: This uses the udoroot, from the Expanded Psionics Handbook, and applies the Half-Farspawn template (from Lords of Madness). It's a lot of fun. ;) In my campaign it appeared in the midst of a burned-out goblin village (the classic 'why are the goblins so close to our town and how can we get them to go home' adventure).
The burned and poisoned remains of the farms and village of the goblins are a depressing sight, but a single 15’ diameter area of bizarre garden remains, choked with writhing weeds of strange hue- orange, magenta and chartreuse. Six sunflowers with red centers and white petals loom six feet high. Two long, thin, flesh-colored tendrils lie coiled like intestines near the edge of the thing. If characters approach it within 60’, it will create an astral construct and attempt to lure them in to it. Anyone making a Knowledge (nature) check, DC 15, can tell that the plant is not a sunflower of any sort.
HALF-FARSPAWN UDOROOT ---- CR 6
CE huge outsider (augmented plant)
Init +4; Senses blindsight 60’, Listen +12
Aura strong chaotic, strong psionic
AC 14, touch 3, flat-footed 14
Hit Dice 6d8+36 (63 hp); DR 5/magic
Immune electricity, poison; Resist acid 10, cold 10, electricity 10, fire 10
Fort +11, Ref (always fails), Will +7 ; SR 16
Speed 0 ft. (0 squares)
Melee 2 tentacles -2 (1d8-4)
Base Atk +4; Grp -
Space 15 ft.; Reach 15 ft.
Atk Options double manifest, psi-like abilities, spell-like abilities, true strike 1/day
Psi-like Abilities (ML 6): at will- energy stun (electricity, 2d6, DC 16), false sensory input (DC 16), id insinuation (two targets, DC 16), mind thrust (ML 4th, 4d10, DC 15), telekinetic force (275 lbs., DC 16), thought shield (PR 16); 3/day- astral construct (3rd level), body adjustment, mental barrier.
Spell-like Abilities (CL 6): 3/day- blur; 1/day- stinking cloud (DC 15), touch of idiocy (DC 15).
Str 2, Dex -, Con 22, Int 8, Wis 17, Cha 16
SQ change shape
Feats Improved Initiative, Iron Will
Skills Listen +12
Change Shape (Su)- this terrible thing can morph into an even more terrifying form, a heaving boil on the earth splattering reddish, blood-like liquid everywhere. In this form the petals become tentacles, the seeds of the sunflowers become hundreds of tiny staring eyes, and great brain-like bulges keep forming fleetingly in the roiling flesh of the monster, a seething combination of flesh and woody material. In this form, the monster gains two extra tentacle attacks, becomes amorphous (cannot be flanked, not subject to extra damage from critical hits), and inflicts a -1 morale penalty to attack rolls against it.