Ossefactor

An Ossefactor is a Drukhari medical implement used by the Haemonculi to accelrate and alter their clients' bone growth. The devices have also been pressed into military service and are wielded by Haemonculi and their Wracks with deadly results.

One blast from the weapon sees the victim undergo uncontrollable, accelerated bone growth, with their skeleton suddenly sprouting spurs and spars that slay them instantly -- and may even impale their brothers-in-arms.