[spoilers] Question regarding EP 10

I feel like shion just randomly powered up in this episode. And enough to even catch a demon lord clayman unawares. And not just that she even got a chance to beat him till he had visible wounds that clayman had to use special regeneration for. Like did I miss a season where all the powerscaling was done? Also is beretta the puppet strong? Why was she allowed in a battle between literal demon lords anyway? Someone please explain
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