You have to knock them out or they won't die :/ Good thing Chaar went to Ms Maighstir's boot camp in how to deal with these sorts of situations. I can link [this] page again. it's all coming together, you see. 

Chaar is the embodiment of "do it scared". or "do it while crying"

TRANSCRIPT:
panel 1: Chaar's sword falls on the floor, corroded away into multiple pieces. The maid leers at Chaar, already growing her severed arm back. Her long, black hair has fallen out in clumps, now lying on the floor.
panel 2: Chaar stands in shock for a moment, murmuring: "they- they can regenerate? then I need to-" An arm flies at her and she dodges.
panel 3-4: She stabs the maids hand to the wall and then goes to pick up the commemorative statue her mom had lectured her about not too long ago.
panel 5: She raises the statue above her head and runs at the maid.
panel 6: Chaar slams the statue on the maid's head, crumpling it.
panel 7: The maid's now grotesquely morphed head lies with her mouth hanging wide open. She wheezes.
panel 8: Chaar stands over her, tears falling down her face, as the sounds die down, she's been fully knocked out.
panel 9: Chaar strikes the final blow, using her corroded sword to stab the maid straight in the mouth, through her head, with a loud squelch.