Decay and collapse had their reasons.
While Oros's reckless extraction of life potential was a major factor, it was merely the catalyst.
This half-plane was neither naturally formed nor created by a True God in the usual way, but rather evolved by a Demigod at the cost of sacrificing her Divine Soul, using the pre-existing special space.
This evolution inherently carried great risks.
Its predecessor was the Divine Kingdom Space gifted to Oros by the previous World Tree, a semi-finished product.
Although that Divine Kingdom Space itself had the potential to evolve into a mature half-plane, potential was just potential, and turning it into reality was a long journey.
The most crucial aspect was to allow the half-plane's origin to fully develop.
Without the intervention of a True God, this growth might take tens of millions of years.
Even with a True God's involvement, it probably wouldn't be feasible without a few hundred years.
