It looks like Shion got the Cronenberg skill. I'm assuming the mist was hiding how horrifying the new bodies of those guys were like before Diablo fixed them.
I was expecting the rematch against Hinata to be a curbstomp but it looks like she'll be getting a power-up of her own going by the opening. Though given the precedent, maybe that rematch won't actually happen until season 4
Loved how Shion had trouble hiding she had no idea what Rimuru and Diablo were discussing. That woman is all muscle and boobs.