Battlecruiser -very very big ship. I won my second game playing against one of these with a pack of Archdeacons. It was pretty scary. In Starknights, all combat is resolved in a real-time combat arena, with both players controlling their fleets if both are online (or the AI taking over if one is offline at the time). Battlecruisers are extremely formidable with their enormous shields and battery of missiles and cannons. But a player with an agile fleet can fly circles around them, and wear down their shields eventually.