Celiss takes a swipe at the creature with her sword, hoping to cut into and through the creature's ribcage. It may be undead, but simply hacking apart organs until it fell over was an option, and a good one, too, it seemed. Celiss wasn't even sure if decapitating it would suffice to make it re-dead.

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Just a normal attack with my bonded short sword.
(1d20+7)[27] Assuming I'm flanking, that is.
(1d6+3)[6] Piercing.