create implication prisma_illya -> illyasviel_von_einzbern
Not really knowledgable of this copyright, so I don't know if spoiler or even the same character, but the wiki page of prismal_illya seems to indicate an alternate appearance of her..
EDIT: The tag implication prisma_illya -> illyasviel_von_einzbern has been rejected by @Kikimaru.
Updated by DanbooruBot