Corporeal

The old man dressed in grey robes felt his eyes sharpen when Ryu appeared.

After reaching the Peak Qi Refinement Realm, Ryu was no longer stuck at the second trial of the Spiritual Severing Realm. According to what the old man first told him, the fourth floor was separated by each of the cultivation realms, starting at the Spiritual Severing Realm. Each had nine trials where he faced a battle spirit, and a tenth where he battled himself.

Technically, the fourth floor shouldn't be much help in comprehending Earth Grade techniques until one entered the Divine Vessel trials, but thanks to Ryu's Origin Flame and innate comprehension abilities, he estimated that reaching the fifth Spiritual Severing trial would be enough to finally gain a real grasp of the Earth Grade techniques he had chosen.