You are a young forest, trying your hardest to grow tall enough to be selected for Cenarious' elite Force of Nature. Gather biomass and water from your surroundings to grow large and strong, and maybe one day you'll be able to call yourself an Ancient.
You are literally a bunch of trees, and you can train wisps using water resource, to plant saplings in the soil around the forest. Roots can drain biomass from grass and small plants nearby. Water is gathered from rivers and rainfall. Uproot trees into treants to fight off invaders, and use spells like Tranquility to put out forest fires.
I haven't coded a single line yet, though.