Thankfully, his bond with mortal Chloe Decker managed to remove his mark, and Lucifer was finally able to end his life.
It all added up to a thrilling season finale before Netflix took over, but viewers still have a few questions about how Cain was able to die.
As Chloe also had the ability to leave Lucifer vulnerable until recently, it was assumed the same blessing was able to remove Cain’s mark during their relationship.
Unfortunately, this logic seems to fall apart in the fifth season, considering Lucifer’s weakened state around Chloe is based more on his mindset than her uncanny dampening abilities.
source: express.co.uk