A Possibility

"The Scared Latus King last sane words wasn't about just the fast cultivation, there were more…" Old Luke carefully remembered what was written in the old records before speaking, "Oh, they were: This forest is like a natural fortress as if it is protecting something!" 

"Strange." Alvin mused but no matter how much he mulled over it these words made little sense to him at all. 

However, Ace who has been listening to them earnestly all this time showed opposite emotions to his usual composed self. His eyes were twinkling with ecstasy and his breath become a little rugged!

A startling thought has completely taken over his mind the moment he listens to this last line of Scared Latus King and it just won't go away. 

'AN ELEMENTAL ORB!'