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The Heroic Oppai Dragon[]
Marsilio first appeared in the short story, Rias in Wonderland (which takes place after Volume 12), where he kidnapped Rias Gremory and placed her in an illusory world created by his Sacred Gear, where there are no Devils, Angels, Fallen Angels, or any other Supernatural Beings.
After two days (which in reality was just several hours) when Rias was about to lose hope, Issei Hyoudou breaks the barrier rescuing Rias and fights with Marsilio. Issei was able to beat him due to Marsilio losing the ability to enter his Balance Breaker. After they had captured him, they told him that his abilities were terrible and that he did not have to envy the main members of the Hero Faction, Marsilio feels satisfied and says that his revenge was complete.
Rias asks him if the world he saw really was an illusion or a parallel world of truth, in which Marsilio responds "If I said it’s the latter, how would you respond", she also asks him if he had showed that world to Cao Cao, to which Marsilio responds that he has and that Cao Cao said that it would be a "Boring" world.
Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy[]
Marsilio reappeared in Volume DX.4, where he eventually became a member of Cao Cao’s team for the Azazel Cup. He, alongside Connla, arrived at the Vatican where Cao Cao, Heracles, and Jeanne were having a meeting and brought along Georg who returned from the Realm of the Dead after being called by Cao Cao.
At the floating city of Agreas, Marsilio arrived together with his team for their match against Sairaorg and his team at the arena and exchange glares at each other.