Kokuma Musou - Ochita Seikishi to Fukushuu no Kuro Madoushi - Vol. 1 Ch. 5 - Demon Sword Lucia

[MangaDex]

 

[GreenDude1]

How the panels were laid out made it a bit hard to follow the action. I think she did some kind of Crystal attack and then he slapped her in a half and then the other guy did a massive fire attack and then she put herself back together.