The immense swarm of small, bee-like attack craft commanded by Krall from the planet Altamid, which tore the Kelvin-timeline Enterprise apart in 2263 and was later turned on Starbase Yorktown.
The swarm appears in Star Trek Beyond. Its thousands of ships are relics of the vanished civilisation that once lived on Altamid, found there by Krall, who is eventually revealed to be Balthazar Edison, captain of the long-lost USS Franklin. The craft fly in tight coordination and attack by ramming through a hull and disgorging boarding parties.
Lured to Altamid inside a nebula, the Enterprise is overwhelmed. The swarm slices off her nacelles and neck and the saucer crashes on the planet, where Krall takes much of the crew prisoner in search of a piece of an ancient bioweapon.
When Krall launches the swarm against Yorktown, Kirk's crew follow in the repaired Franklin. Realising that the ships depend on a shared signal to hold formation, they disrupt it by broadcasting loud music on the same frequency, a Beastie Boys track, and the swarm collides with itself and burns.