Talk:Extra Booster 2: Great Clash!! Dragon VS Danger/@comment-25004901-20140716192730/@comment-13275021-20140716223255

According to Thunder Knights, Brass Shield Dragon's flavor text, the Purgatory Knights are "the heroes that saved the world hundreds of years ago. The Thunder Knights were formed to honor that spirit."

This kind of implies that the Purgatory Knights aren't around anymore. Thunder Knights, Dragoarcher's flavor says: "Heading off to the demon realm, not wanting to lose to the Purgatory Knights."

Finally, SP Kommandeur Fahne's flavor gives the most obvious hint that the Purgatory Knights are now evil (probably hinting at Darkness Dragon World): "That's impossible! For the Purgatory Knights to return as cursed beings......!"

So, it's likely that this "Demios" mentioned in Death Sickle Dragon's RRR flavor text ("Demios... I am off to challenge them.") returned to challenge the Purgatory Knights, and has cursed them to become evil beings.