The text Han Sen saw across the tower was in a human language, but he was too lazy to think about that. The content spoke about the Blood-Pulse Sutra. This surprised him, though.
The text didn't concern itself with the main parts of the Blood-Pulse Sutra, and neither was there anything applying to Life Door. But when Han Sen read it, he noticed it was a secret method that could trigger a hidden power of the blood. It was similar to the shura triggering their Shura Change.
Those who hadn't studied the Blood-Pulse Sutra would believe the text upon the wall made no sense, but Han Sen and God's Retribution ended up looking at each other in shock.
"Does this place have a connection to the Blood Legion creator, the Human Emperor?" Han Sen was merely guessing, as he tried to remember each and every word and sear them into his memory.