"Girded in chrome is a hundred-dimpled titan, an egg sac where rocket children ignite on their mother's back, explode into aether, and congeal again in the conflagrative consummation."
This is the ranged missile weapon carried by Chrome Pyramids.
It can be obtained by disarming them and is occasionally also found in the wild and in high level merchants' inventory.
Next to Neutron Flux, the Swarm rack is the most destructive weapon in Qud. Each attack fires a burst of 10 separate missiles, each one hitting for an 3d6 impact and then exploding in a big area for 6d6 of explosion damage that can't be resisted by AV or DV.
The enormous weight of 1500 makes it nearly impossible to wield, unless one applies Tinker mods to it to reduce the massive weight to a manageable level. Then you will need to acquire lots of HE Missiles if you wish to even use it.
Another way to carry a swarm rack is to go through the enormous effort of building or aquiring 150 of the rare Small Spheres of Negative Weight. 150 spheres compensate for exactly the weight of the swarm rack. This not only requires Tinkering Level 3 but also a huge amount of rare resources.
Alternatively you can just disassemble it for the rare tinkering resources 'A555567'.