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Throwing Seraph into the Frostbite arena with a Beastcall aria is a classic move, what are you talking about? It's been around since 2017. And Marvin, who reduces the countdown timer. Something similar almost happened to me, during a rotation, actually.
But in the unlimited mode, I don't have Seraph. There, the old version is used, and I only have one of him, but I have three new ones, and it's not certain that they are interchangeable.