sorry if im being dumb, but how do they burst? is it just a thing in the show? or do they really spin 360? also im really sorry if this is wrong forum or something.

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paimon says: 
EHE TE NENDAYO    
if you dont see yellow in this signature, you need primogems.

turn your face sunny side up.

Once the center of apocalypse turns red, and the contact point on the sword gets hit, then it will burst.

For genesis, same thing except on both sides I think.

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Spriggans and Valkyries are the best,
But I like Achilles and Dragons too.
Fafnir and Longinus are also cool,
But Diabolos and Ragnaruk are for you.