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Within the Blazing Tower of the Venerable of Flames, the Trial that Surtr and his party was undergoing was reaching its climax.
After having gone through the Floor 95's mighty Boss, they made their way through each subsequent Floors.
From Floor 96, a land filled with millions of Inferno Ant Colonies, to Floor 97 which was a Swamp of Burning Toxins, where gigantic Blazing Venom Boas and Volcanic Alligators lived, they had to both adapt to fight against countless foes at once and to survive in incredibly harsh conditions.
The millions of Rank 7 Inferno Ants, which alone were nothing, but together became a terrifying and near endless threat that had to take everything they had to conquer, Surtr having to take down the Queens one after another so they couldn't produce more offspring.
Check "The Protagnist's Sister Is Actually the Strongest"!