Era beginning/end
Marks the span between the Era of Chaos and the Era of Order where time itself broke down to reassemble.
When the later named Era of Chaos ended with the detonation of the fourth Chaos Floor, the aftershock not only raced though all of Creation, it also damaged the very concept of time itself. As time is crucial in describing everything, it is impossible to say what happened during the aftermath exactly. Only when time repaired itself on the start of the Era of Order, description of events were possible once again.
Several historians speculate that during time's rupture, everything and nothing happened simultaneously. The few entities who survived this cataclysmic event have problems to remember what happened before and couldn't even beginn to comprehend what happened between the Eras.