Lin Xun's Shell slots were twelve in number. Besides the eight main Shells, the rest could be discarded and replaced. There were basically enough vacant slots for now.
He decided to discard the dead scapegoat Shell and exchange it with the initial IC's 'Monk' Shell, plunging into the 'Sea of Corruption' to experiment once more.
Based on the information divulged by the Dean previously, people who fail feathering would be turned into demons and chased into the 'Sea of Corruption'.
Maybe using a feathering-failed Monk to enter the sea would bring about different events.
[...]
[You fly over the sea on your sword, looking down at the ocean below...]
[However, apart from the endless amber-colored seawater, you can't see anything else.]
[Would you try to dive into the 'Sea of Corruption'?]
[You possess the body of the 'Feathered Monastery Monk'!]
[Without the flying sword under your foot, you drop into the vast sea...]