Chronicles of Time
The Ascended Planes are legends. Planes of an even higher order that are perhaps the true homes of the Gods. Perhaps of chosen mortals, or perhaps are simply where the spirits go beyond death.
There is no proof that these planes truly exist, if they do, no one has found a means to travel to or from them to knowledge.
Ascended Planes are theories, and those whom claimed to have traveled to an ascended plane likely mistook a more advanced common plane or a higher plane as something far more.
Planes walkers have even searched the wisdom and council of Elementals and other planar beings, and found no such collaboration of such places.