Hearing Eliana's words, Alros' eyes widen while thanking the Demon God that the Spirit Tree is a small one. The gap between a B-rank against A-rank is already wide enough. He did not plan to see the difference between A-rank and S-rank just yet.
"Also-" Alros focused back on the elf, who are still not finished, "-the Spirit Tree could also create other creatures. They are split into two categories, guardians and overseer. Guardians are often monstrous creatures that created with the power of the Spirit Tree to protect the Spirit Tree from danger.
As for what the guardians usually are, they are varied, but they sometimes took the form of a large Treants, or they will look like a Treewraith, as well as many other forms. Then, the overseer. They are created to help the Spirit to watch over the Spirit Tree, and the forest created by the Spirit Tree.