The Greater Nature Spirit reached Mid Tier-3 after merging with the Legendary Artifact, Domain of Natura. It was a great surprise, especially after Michael found out that the Greater Nature Spirit integrated the Legendary Artifact's domain into one of its main abilities.
The domain's range and full effect was applicable all over the Michael's territory and extended even further, nourishing the Untamed Jungle's soil, flora, and fauna. The origin energy in the surroundings was pulled to the Greater Nature Spirit, creating a highly condensed energy zone around the Greater Nature Spirit.
The energy zone was energy-dense and would allow Tierless Summons to advance to Tier-1 in no time as long as their talent and understanding of their energy absorption technique was high enough.