I think that the Spirit of Nature should look like a huge mass from that picture (Daughter of Light?), but with more distinct features, hands, with bees, like a dryad, and with a head like an Ent from KB.
Essentially, they are spirits of nature.
Who is bigger?
A huge, ancient, wild Ent on four pegasi. On its head are two horns, which a great druid is holding onto, creating an antimagic field. On its back are six huge angelic wings. Three hollows, each with a master archer. The number of hands is comparable to the number of branches on a normal tree. In its right hands are huge maces, in its left hands are large steel shields covered in dragon skin. A flying chariot is tied to the back, in it is a first aid tent, a cart with ammunition, a hero, and a ballista that this hero has enchanted with Armageddon.
:D
