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Ryo and Amiphossia battled against the two Jungle Kings with everything they had. However, the monstrous creatures were incredibly strong, and had such a powerful barrier that it let them block most damage with ease.
Ryo's devastating blows that could potentially destroy whole Realms back in Genesis were dealing no damage at all, neither the strongest magic attacks nor blade techniques from Amiphossia, which employed the souls of thousands of beings converged together.
It was quite clear as they entered this world, but the Realms of power were much more elevated, and S Rank creatures could be compared to Supreme Gods levels of power. To make things worse, some sort of Divine Technique utilizing the source of three different energies converged together was helping these already overpowered monsters resist the damage even better.
Check "The Protagonist's Sister Is Actually the Strongest"!