[Bonus chapter] Rank 6 NPC Beauties 1
The kind of energy that Hikari, Zaine and Roma were swallowing was enough to upset almost the entire Island in the Void. For sure if they did this outside, the entire Continent would feel their power up, which made one wonder, how did the current Rank 7's power up?
The answer to that was pretty much why there were very few, if any, Rank 5 and above NPCs in the main plane. Truthfully, leveling up was hard, but not too difficult if you want to spend time on it.
However, one would have to prepare materials for their ranks up, especially Aether Crystals in order to create Aetheric Energy. After all, there was no way you could just rely on Worldly Energy after Rank 5.
And now you knew why Aether Crystals have such a nonsensically high value. If Draco said he would give out all the ones he had to various forces, many new Rank 7's could be born, but he was not that benevolent yet.