First time to see this!

[Dainoji]

FLONNE smashes her PRIMEVAL BATTLE FLAIL OF THE BLOOD GODS toward THUNDER LIPS with devastating force.
FLONNE roars uncontrollably as she attacks! (-Rampage-)
Whoosh...several ribs are driven into the lungs! (+1822 Damage)
THUNDER LIPS tries to give up!!!

An ominous column of red and black mist shoots down upon THUNDER LIPS! (-Kill-)
FLONNE disarms the fallen gladiator and strikes a pose over the dead carcass!

Flonne's weapon had 51 points of Kill Rank on it, so I guess that is what it does! :p

[oedi]

Cool nice that it shows, ive always just thought it added to the generic chance of a kill.

[Prinny]

Awesome, I have multiple glads with kill ranking on their armour but this is the first time I see that text! xD

[Apoca1ypse]

that's rather nifty :)