This creature looks like an animated, yet dead, moss-covered tree. Its bark is darkened with age and no leaves appear on its branches.
Lightning Treant [3pp]CR 8
AC 22, touch 7, flat-footed 22 (-1 Dex, +15 natural, -2 size)
hp 138 (12d8+84); fast healing 10
Fort +15, Ref +3, Will +7
Defensive Abilities electric healing; DR 10/slashing; Immune electricity, plant traits; Resist fire 10
Speed 40 ft.
Melee 2 slam +16 (2d8+9)
Space 15 ft.; Reach 15 ft.
Special Attacks double damage against objects
Druid Spell-like Abilities (CL 12th):
While many types of treants might make an effort to negotiate, or at least try to determine whether or not travelers might be hostile to whatever forest they are living in, lightning treants tend to simply attack first and, quite frankly, not question anything. Using their ability to call lightning storms, these creatures can be a true bane to travelers, especially those that do not recognize them at first.
Lightning treants have an inherent hatred of all humanoids and attack them on sight. If there are more than one or two in a group the lightning treant starts combat with a chain lightning spell and then uses call lightning storm to have further lightning bolts ready; afterward, the lightning treant charges into combat, focusing first on anyone with an axe or other slashing weapon. If combat goes against it, it uses lightning bolt on its enemies, as well as using bolts called down with call lightning storm to heal itself or hurt its opponents.
Str 28, Dex 9, Con 24, Int 11, Wis 17, Cha 11
Base Atk +9; CMB +20; CMD 29
Feats Cleave, Greater Sunder, Improved Initiative, Improved Sunder, Power Attack, Skill Focus (Survival)
Skills Knowledge (nature) +4, Stealth -2 (+14 in forests), Survival +7; Racial Modifiers +16 Stealth in forests
A lightning treant that makes a full attack against an object or structure deals double damage.
Electricity damage heals a lightning treant 1 point of damage for every 3 points it would otherwise deal. If the amount would cause the lightning treant to exceed its full normal hit points, it gains any excess as temporary hit points–these temporary hit points last for 2 hours.
Environment temperate forests
Organization solitary, pair, or grove (4-8)
Unlike most treants, this creature appears to be a moss-covered dead tree, with bare branches stretched toward the sky. Often living in the shade of larger trees, or in the wasteland of a destroyed forest, lightning treants are strange, angry creatures whose powers and talents are almost elemental in nature. Confused by some travelers with shambling mounds, these creatures are much larger and the moss-like vegetation they are covered with is only a thin layer over their hard wooden core.
Lightning Treant from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Author Casey Christofferson.