Yennefer.
Yennefer isn't just a pretty face or a mage. She's also quite an accomplished swordsman. She mixes magic with sword play, and ends up taking out a fair number of boarders. That is until she gets stabbed in the gut, just as her friend stabbed her with an arrow back in the Battle of Sodden Hill. Thankfully, she's not falling from a great height after. She's not going to bother to heal herself during this fight, and with move to snapping necks with her magic. That's fair easy in the grand scheme of things.