Quoted By:
In my autistic imagining of the final fight, everyone but the knights Gonathan and Lady Bloodflame had been corrupted. Thus the final standoff was between the Stain King, who had originally possessed Biboo, and Gonathan and Lady Bloodflame. They were cautious because hurting the Stain King would be hurting the princess. It ended with Gonathan G, whom the Stain King ridiculed for failing to save his companions from falling into corruption and losing his precious Pearl, once for all slaying the Stain King and triumphing as the Hero of Libestia
It was super cool in my head