This follows the final moments of the sin of pride, known as Priahn (although his vessel is called Cassian) This follows the slaughter that he has inflicted upon the kingdom, and his encounter with THE MAGE soon after. This is exactly how Priahn ended up in the cyan vial.
This is going to be a running project, which will include every sin, and maybe some bonus side stories alongside it. [SPOILERS SO DON'T SCROLL UNTIL YOU'VE WATCHED THE PROJECT] The fight section is a bit short, but that's on purpose. Priahn's style of fighting and weapon is nowhere near enough to keep up with THE MAGE, as seen at the end where Cassian has to hold his rapier with two hands, and is still unable to hold THE MAGE back. And yes, THE MAGE did cut Cassian's head off.
