The easiest way to summon this behemoth basically makes it at least a 5k beatstick, but most kinds of removal work on it, putting all the effort of summoning the materials to waste
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Lonefire Blossom: Successfully complete Gungnir, Dragon of the Ice Barrier three times
Judai struggles with Ra's overwhelming attack power and complete effect resistance, but when he is in danger of receiving a direct attack due to the effect of Neo-Spacian Glomos while fused with Ra, he uses defusion to absorb Ra's attack power as life, and Ra, whose attack power becomes 0, is destroyed by Glomos