The Ossefactor is a Drukhari weapon that kills you with your own skeleton. One hit triggers runaway bone growth, and the victim’s body sprouts spurs and spears that tear them apart from the inside.
What the ossefactor actually does
The ossefactor fires a blast that forces uncontrolled bone growth in the target. The skeleton doesn’t just thicken, it erupts: spurs and spear-like growths punch out through flesh and kill the victim almost instantly.
The nastiest part is the reach. Those bone spears don’t politely stop at the victim, so anyone standing close by can get impaled too. In a packed melee, one shot can gut a whole cluster of infantry.
A medical tool turned weapon
Haemonculi originally built these devices as surgical instruments. They use them to sculpt bone growth in their clients, working through what the sources call osteocytic impulsion waves.
That’s the grim joke at the heart of the ossefactor. The same mechanism that lets a haemonculus reshape a paying customer’s skeleton, cranked up past any safe limit, turns a body into a shrapnel grenade.
Who carries one
You’ll see ossefactors in the hands of haemonculi and their wracks, the twisted flesh-crafters who serve them. Wracks often mount one in a secondary arm, so they can keep a blade free while still firing.
It shows up in the Drukhari ranged weapon lists alongside splinter weapons, blasters and dark lances, but it plays a different role. Those guns are about volume of fire or punching through armour. The ossefactor is about turning a body into a hazard.
- Wielded by haemonculi and wracks
- Frequently fitted to a wrack’s extra arm
- Classed as Drukhari ranged wargear
Where it came from
The ossefactor isn’t ancient Drukhari tech. It was developed by a haemonculus coven called The Hex, and they got the idea from studying captive Black Dragons Space Marines.
The Black Dragons carry a gene-seed defect that makes their bones grow into sharp, blade-like protrusions. The Hex worked out how to replicate that mutation on demand, then weaponised it.
It’s a neat piece of lore because it ties the Drukhari to a loyalist Chapter. The haemonculi didn’t invent a new horror, they copied one the Imperium already lives with and pointed it back at them.
Key facts
- The ossefactor is a Drukhari ranged weapon used by haemonculi and wracks.
- It triggers uncontrollable bone growth, so the victim’s skeleton bursts out and kills them.
- Nearby allies can be impaled by the bone spurs too.
- Haemonculi originally used ossefactors as bone-sculpting medical instruments.
- The Hex coven developed it after studying captive Black Dragons Space Marines.
FAQ
What does the ossefactor do?
It forces uncontrollable bone growth in whoever it hits. The victim’s skeleton erupts into spurs and spears, killing them almost instantly and possibly impaling anyone nearby.
Who uses the ossefactor?
Drukhari haemonculi and wracks. It’s a haemonculus surgical tool that’s been repurposed as a battlefield weapon.
Where did the ossefactor come from?
The Hex, a haemonculus coven, built it after studying captive Black Dragons Space Marines and copying the bone-growth mutation that afflicts that Chapter.