Speculation

With blood and wounds covered his entire body, a friend who sacrificed his life to save him, a voice echoing inside his mind was like a silver hope

“The chaos god is interested in you, and wants you to be his avatar. Do you accept?”

With the release of mana and the ‘dungeon’ appearing, inside this ‘dungeon’ there were filled with monsters

Here, mankind will step upon their greatest evolution and create their own myth, including Ryan.