Something strange happened 50 years ago. Anyone connected to Lind Frey felt his Qi once more, a thousand years after he died saving the Celestial Fields once more, but after that something even crazier happened.
The Fiends lost their minds.
They were always clashing with someone, Even after their massive defeat, the Sovereign Tiers had quickly dispatched lower realm cultivators to lay claim to empty areas in the Endless Peaks.
Everyone also assumed there were still centers of power none knew about that they were securing as well.
Still, their attempt to make a foothold had not gone smoothly, The 2nd layer was a dead zone to them. The 1st layer was too weak to ascend and they Fiends there seemingly suffered heavy losses that only a stalemate could be maintained after a fierce battle.
Not enough time had passed for more long term plans to bear fruit. That was the consensus of many powers save 1.