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Ervas and Veronica fused their souls to fight back against the soul-shattering explosion made by Hekaton's Familiar Spirit Bomb.
They felt as if their very souls were fragmenting and shattering into tiny pieces as if fading away into ashes, their very cores were breaking apart, and their entire beings were torn away.
But Veronica activated Perseverance.
By fusing, both souls were able to use the skills and powers of one another, as they were a single and whole being.
Veronica shielded Ervas physical body by sending him inside of the inner realm of her soul while leaving her giant armor to be disintegrated, which she didn't really mind much, she could always generate more, and even her mechanical equipment could be regenerated.
But for now, the only thing that mattered was to resist this power.
Check "The Protagnist's Sister Is Actually the Strongest"!