Warhammer 40K Tyranids

Tyranids are a devouring alien swarm, from masses of Termagants and Hormagaunts to huge monsters such as the Hive Tyrant and Norn Emissary.

Starting a Tyranids army

Combat Patrol: Tyranid Assault Brood and Codex: Tyranids cover the boxed force and rules. Add Termagants and Hormagaunts for numbers, then larger creatures such as the Hive Tyrant / Swarmlord or Norn Emissary / Norn Assimilator.