I'm reading this in between other series so the context of the story is not too deep yet
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Overall, it is not about a revenge story but more of a broken trust and shattered relationship between Sasha and Haise/Hyce. The story progression so far is SOOOOOOOOO much better than
This in every way.
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As mentioned, the story focus more on relationship and broken trust. Hyce was almost killed before he awakened his power, he assumes that Sasha and Co wanted to get rid of him by sending him into the fields to gather herbs with a black dragon near it. After that event, Hyce become a total anti social person who refuse to interact more than necessary. His skills allows him to summon various modern firearms that only he can use.
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Now what this series done right is that after the broken relationship with Hyce and Sasha. Her party (Sacred) didn't immediately go into chaos because you know "A CORE MEMBERS IS NO LONGER THERE" trope. Instead, each of the member now required to master the role that Hyce use to fulfill and they managed to do so.
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Sasha and Hyce relationship after the incident was very tense. Sasha really wanted to apologize to Hyce and wishes to reconcile so they can continue their dream of becoming great adventures. But Hyce on the other hand, retorts Sasha's by saying that she is just saying that so she can achieve her personal goal, and for Hyce that goal is no longer his goal and he doesn't give a single shit about it anymore. Despite all this, both Sasha and her Clan and Hyce still managed to reach the highest rank attainable, the only difference is their personal goal/
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Sasha want's to create the strongest Clan to conquer the forbidden labyrinth while Hyce wishes to conquer it Solo but could not care less about glory and fame.