For the next few days, Rex barely allowed himself to rest as he journeyed through the forest while giving his all to fight and develop himself.
More than once, during the few encounters where he met an advanced mystic beast or a group of intermediate mystic beasts, Rex was close to death but his great Vampire vitality and Grey helped him through it all.
His most harrowing encounter was when he flew into the territory of a mystic Owl Clan that lay deep in the forest.
Barging into unknown territory was a taboo in the Great Forest of Elias, Rex broke this unspoken rule because he was always strong enough. This time though, he met beasts that were stronger than him.
The Owls fought and pursued him for a long distance, leaving Grey heavily injured in the process as he barely escaped by the skin of his teeth.