Ambushed By Giant Flying Squids!

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Monsters according to the Adventurer Guild were classified in Ranks aside from their Mana Core Ranks, this was because sometimes, due to circumstances such as special mutations, the environment, or special abilities, monsters might be stronger than others with higher Ranks of Mana Cores. Unlike the linear growth of people, monsters can grow in all directions and develop strange powers that can rival magic but not be magic exactly. Usually, the Ranks are from F Rank all the way to SSS Rank. And these enormous, five-meter-big Flying Squids were between C Rank and B Rank, they're already strong enough to destroy an entire village if it wasn't because they live in the sea.