Buying Skill Crystals

Even if an elemental spirit awakened an elemental law without any elemental law stone, then they could use an elemental law stone to learn another elemental law.

That is the reason why Ajax thought about Zen even when he had already awakened an elemental law without an elemental law stone.

However, it was the same reason why Ajax eliminated Zen because there were other elemental spirits without any elemental law. 

'Cerauno's case is also similar to Zen, so, I think, it is better to remove Cerauno from the list.'

'Volcanis and Ignis already used an elemental law stone. So, they can't use it.'

'Spirus, Slait….'

Soon, he gave a reason for every elemental spirit's name from the list to remove and finally found three names where he didn't find any major reason to remove them.

And of course, they were none other than "Halo, Blood and Prophis."

These rare auxiliary elemental spirits.