Let's look at the term “tale transcendents” broken down:
Thus, these are the tale transcendents (or tale transcenders), sources from which all other stories flow. They rise above the others, yet even these are not absolute; their origins have been lost or tarnished, distance separates even them from the absolute truths of history in which they occurred. These are the tale transcendents, the first lies of humankind (for our memories fail us fast) and our greatest.
Whether telling of gods or mortals, beast or plant, these tales transcend all others; these are stories – some true, some false – that take the human spirit where no mere mortal can ever go. These are the sources from which all other stories flow.