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Mina and Nadia hadn't been slacking off while everything happened, despite being pregnant, Giant women had plenty of stamina and strength, especially those that had ascended into Goddesses such as them. Much like Surtr, they went through the ruthless trainings of the two Venerables, their Souls and Divinities had been refined and enhanced to their very limits, revealing to them a whole new hidden potential within them.
It was an agonizing training, as both of their souls were unrefined and weak at the beginning, but now, after both of their souls hit SSS Rank, they were overflowing with power, and their bodies in response to their Divinities, also became tougher and much more energetic. Alongside that, they had been training their Fire Dragon Bloodline powers, which Surtr had inherited to them long time ago.