Oh hell no to human military. We don't need that many people with boons. Instead, we could make Ustan have a Chaos boon, so he can 'deflect' enemy magic, and we can make creatures for the other things. Hopefully, once we clear out more of the forest, which we should do, to make more room, we can start making 100 or more plant soldiers per day. The first shall be their commander, and grants more intelligence, free thought, and the ability to make strategic and tactical decisions. 10 others shall be lieutenants in charge of squads and eventually regiments, with a lower level of intelligence, but tactical decision making and such. Basically, we need commanders so we don't have to focus on them while they're fighting.
We should make Saps, about eight feet tall, thick, look heavily muscled(though it's vines), and can use our heavier weaponry arsenals. Plants can change while they grow, but other than that rarely change. However, our Stems should have flowers buds for hands. They can blossom into the right weaponry, and fall off into seed bearing fruit when no longer needed. To preserve energy efficiency of their metabolisms, seeds would thus no longer grow in their hair. Additionally, ammo for various ranged weapons would grow from seed pods along their thighs, abdomen, and lower back, including 'grenades, of various types. These can of course asily be changed as to what types grow, or if any grow, by their commanding officers who have an innate knowledge of how this wold work. Now for a list of weapons used by our soldiers.
As for fast attack recon type units, morphing dogs or wild cats into a humanoid shape, with similar weapon making abilities possibly based on animals like skunks, porcupines, and platypi, would make a force to be reckoned with.
For artillery, large yak like creatures, who can function as slow, but incredibly strong beasts of burden, with 'cannons' on their back,mwhich can fire different types of ammunition. I want us to be versatile, powerful, and diverse. This means that should Krait or a different god of disease or poison shows up, it'll be more difficult to tailor their weapons to all of our troops.
Our major troops being plants, they are likely to be tough but unreactive, likely feel no pain, but are also slow. To provide a counter for this, we need some mounted troops, some transports, and some support units. I suggest that we make the Mother, which should look like the love child of a beetle, a mammoth, and a tree. Seed pods grow within it, it has large cavities for protecting it's charges, and with various protrusions for offense. Thick carapace armor and large tusks help it for defense and close combat. It's helpers and 'children' are mantis like creatures which have a symbiotic with it. They help take care of it's seeds and gestation sacs, as well as taking nutrients from it, and help protect it's relatively vulnerable insides from enemy boarders. In turn, it shelters and feeds them, letting them do the work needed to care for it's charges and keep it healthy, picking away parasites and having organic terminal like things they can access(and only them), an aspect of Chaos within it's design allowing them to change it's aspets and organic materials, for example the carapace becoming thicker at the expense of it's weapon systems, or regenerating quickly, or adapting to become immune to a new toxin or illness. It can feed on blue melons and blood melons, needing the latter for animal based troops, and the former for plant based ones. However, it can also feed on the organic soup made by the Scavenger. A wiry creature with a bloated torso, it feeds upon our dead soldiers, melting their entire bodies down for the Mother's consumption and recycling. Why? Because otherwise our troops might rise again on the wrong side of death.
We need command troops! Like a Queen for the Firejackets, who can make decisions instead of us!
Weapons:
Thorn-Blade: Also a Bone-Blade for animal troops, just a generic sword, made of plant material, that is long, pointy, and sharp.
Thorn-Fist: Bigger fist with a few big thorns(or spines for animals) to bash through the thicker armor and penetrate body cavities.
Lasher: Whether based on a tail or a vine, a mobile, controllable whip with quills/thorns on it to hit from afar.
Livewood Spear: Essentially a long, strong pole, with a small Thorn-Blade on the end, to account for enemy mounted troops.
Hand: You know, a hand. To be handy.
Wide-Petals: A shield, essentially, made of hard flower petals. Not really feasible for our fast attack animals, so not really usable by them.
Pistil: AHAHAHAAHAHAHA get it! It's a pistol! It can fire Pollen or Thorns. Explain those in a bit. Might be called a regurgitator and fire Spines or Quills for our Beasts.
Petal Rifle: A basic rifle, not really made for rapid firing, more for long ranged accurate support. Fires Pollen, Thorns, or Spores. Animal version is more like a sniper rifle, firing Finned Spines.
Stem Gun: Shorter range, faster RoF. Fires the same ammunition for Plants, fires Spines, Quills, or Sacs. Usable by both 'breeds'.
Root Cannon: Big gun. Fires Seed Pods, Bulbs, or Spore bombs. Usable by Saps.
You guys can think of more, can't ya?