State of epiphany.
This was the state Eren was in right now after his breakthrough. In this state, he was connected to something that was known as higher consciousness.
Every question rankers had about their path could be answered in this mysterious state by the higher consciousness that was supposed to be all-knowing. A conversation with such consciousness was something that was sought-after by all the rankers.
This mysterious state of being wasn't something one could enter willingly under normal circumstances. It would only happen rarely. According to most rankers, epiphanies can occur when one is in desperate circumstances, undergoing breakthroughs, or practicing deep and secluded ranking techniques.
However, it was not a hard and fast rule. Sometimes rankers achieve the state of epiphany by doing mundane things.