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Because Frank didn't wanted to risk the lives of those he loved, he ended deciding to do something quite different, generating a special formation of many runes and materials that could summon his allies into battle as if they were avatars, with almost their complete power if not even more boosted as they merged their own power with his own and the Yggdrasil Tree. He called them Spirit Avatars… and right now, he needed as many as he could summon!
"We don't have enough time! Everyone, come!" Said Frank, as countless summons began to appear all around him, while his strong monster pets, confident on their own raw power also emerged. And behind him, an enormous army of never-ending Undead also appeared!
Check "The Protagnist's Sister Is Actually the Strongest"!