Seika doc says "あらゆる宝具の原点をもつギルガメッシュだが、他の英雄がもち得る他の宝具とは違い、乖離剣エアだけは彼 の みがもち得る唯一無二の存在。そのため、「無限の剣製(アンリミテッドブレイドワークス)」でも複製するこ とはできない。
Though it is wielded by Gilgamesh, who has the prototypes of every Noble Phantasm, the Sword of Rupture Ea is different from the other Noble Phantasms that can be possessed by other heroes. It alone is a completely unique existence that can only be possessed by Gilgamesh. Therefore, even with Unlimited Blade Works, it is impossible to reproduce it.
Interesting. So less crazy alien materials, more THERE CAN BE ONLY ONE."
look at me i posted runes. am I a cool kid now? can we take this to the questions thread?
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Ea's unique existence should mean that no successors can be made. Alternatively, since Ea existed before "sword", every sword ever is Ea's successor.
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Or not. Probably not.