The Part Ship - also known as the Particulate Ship - specializes purely in the destruction of particles. Particles are created by Particle Emitters and will damage ships on impact as well as multiply creeper underneath them.
The creeper multiplying capabilities of particles are a very dangerous threat that should be neutralized quickly. Due to the fairly short range of the Particulate Gun, the Part Ships are best deployed as close to the frontline as possible so they can take care of as much particulate as they can.