1851. Paranoid
The Kesier runes were almost a universal resource. Every expert who had searched methods to improve the sea of consciousness knew about them. Even the hybrids who had lived in the Outer Lands had learnt about the best training method for mental spheres.
Some might have never seen Kesier runes. Their heroic versions were quite common inside large organizations, but many divine beings might have never bothered to search for them. After all, everyone had developed personal training methods by that point, and finding suitable versions of that resource was almost impossible.
Noah had never bothered to look for the Kesier runes after his ascension. He wasn't even sure whether those resources existed in the Immortal Land.