13HD works. How are the abilities on the forest giant?
Powerful, lanky, and strictly carnivorous, jungle giants are a terror to all the animals of the tropical forests. They are great hunters and stalkers, able to clear a huge tract of forest of all game and then move on.
Jungle giants always carry everything they need with them: tools for making and maintaining their weapons, firestarters, tinder, and spare bits of leather and sinew used to repair clothing. They also carry their valuables, and every adult jungle giant carries a quiver of arrows.
Combat: Jungle giants use 15' long bows crafted to take advantage of their tremendous size and strength. These giants are very quick with their huge bows and can fire two arrows each round.
They will use poisoned arrows to bring down their prey more quickly. if these arrows are used in combat, opponents must save vs. paralyzation at -2 or be rendered immobile for 2-12 turns.
Even humanoid creatures with the strength to pull a jungle giant bow cannot use it, because the arrows are over 6' long (2d6 +9 damage). Jungle giants will occasionally use the trunk of a dead tree as a club, doing 2d8 +9 points damage.
Jungle giants prefer to take their prey from ambushes, firing their bows from the treetops and then swinging down sturdy branches or thick ropes to finish off their prey. Camouflaged giants cause a -1 penalty on opponents' surprise rolls. When setting up a blind, they can camouflage themselves in jungle terrain with a 60% chance of success. Setting up a blind or decorating themselves with jungle camouflage takes three turns.
A jungle giant village is 50% likely to shelter 1-6 giant dragonflies.
Ecology: Jungle giants think of most creatures as prey, but those they accept as fellow hunters they respect as equals, regardless of their size. Although they much prefer the jungle terrain they know so well, they are often forced to leave the trees for the savanna when their numbers become too great to survive in the jungle. They think nothing of eating every snake, antelope, cat, warthog, ostrich, and elephant they come across. Jungle giants on the savannah often return to the forest, because their great height makes stealthy hunting difficult for them on open ground.