Tiny drone fighters controlled by Krall, which attacked in vast swarms and tore apart the Kelvin-timeline Enterprise.
Swarm ships were tiny drone fighters controlled by Krall from the planet Altamid. They attacked in vast coordinated swarms that behaved almost like a single organism, overwhelming the shields of far larger starships.
In Star Trek Beyond, the swarm tore apart the Kelvin-timeline USS Enterprise and forced its crew to abandon ship. Kirk's crew later disrupted the swarm's communications by broadcasting loud music from the old USS Franklin, and the formation collapsed before Krall could unleash his weapon on Starbase Yorktown.