Normally Eren would have had more difficulties achieving Adet rank because of his special existence. However, Kilaba was a monster who had progressed enough in his evolutionary path to allow Eren to overcome his ranking bottleneck without a hitch.
Eren's Elemental Condensation was different from any other ranker though. His mana core began incorporating world law runes of all the grand elements rather than just the ones he was used to.
Eren gritted his teeth and felt every muscle in his body rupture and rebuild. Every cell in his body was now incorporating more of the world's mana into it. His flesh and bones were getting strengthened by mana as if they were artifacts in their own right.
An Adept-ranked mana cloud was soon summoned all around him. His mana core spun with even heightened efficiency than before and drained the mana cloud surrounding him.
After another couple of minutes, Eren's breakthrough into the gaseous state of the Adept rank was stabilized.