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Nepheline, after analyzing the city and grabbing some shinty shells for herself, walked into the castle, forcefully opening the gate using her stone and ore manipulation, which even applied to Orichalcum after her growth so far.
It took her some effort, but it didn't seem to be something overly taxing either, this just showed how strong she had become, as Orichalcum had always been deemed a metal impossible for normal people to even mold or wield, the toughest of them all.
Yet, after Nepheline grew stronger to the point she is right now, and after learning the true origins of this metal, she grew capable of wielding it, although not without difficulties or effort.
However, the moment she walked to the last room in the castle…
SPLASH!