For so long, Erik focused on enhancing the Chimaeric Demon brain crystal power that he basically forgot to power up everything else. It had been a good choice, yes, but at the same time, it created some setbacks he now had to address.
Making more neural links for it improved the hatching speed and strength of his clones.
While this had been necessary, after the encounter with the Leviathan Serpent, Erik realized he had neglected his own personal growth, which would make the Chimaeric Demons stronger in turn.
Growing stronger was a win win situation for everyone.
The experience that Erik had with the Leviathan Serpent was truly enlightening and opened his eyes to a whole new perspective. If there were many thaids strong like it on the Mur continent, he wouldn't stand a chance in a direct fight.