The First Five

First came the The Primordials and secondly came the Titans.
Thirdly was the Dragons and in fourth was the Gods.
Last but not least were the Originals.
With the Rise and Fall of the Last Titan, arcanists found out and revealed the existence of these First Five.
The awakening of the first five types of entities happening in twos for the first four gave rise to the popular historical theory that when there is a force trying to cause change, another rises to challenge it. It gave rise to the understanding from an analysis of history with the theory as context that heroes will always rise to face off against villains and vice versa.