planetary coast guard
interceptors are capital ships capable of outmaneuvering and outrunning most other ships before they exit interdiction range or weak planetary magnetic fields and unfurl their plasma sail or metric drive bubble - thanks to the monstrous power of their Medusa drives, gigantically oversized, reverse-oriented versions of the typical magnetic confinement torch drive that drag (instead of push) the ship forward as they detonate nuclear bombs for power instead of simple fuel pellets. this makes them suited for the frontlines of fleet combat and planetary defense alike.
