Asteroid warfare

The Destruction of Galisus during the Krogan Rebellions is an example of asteroid warfare

Asteroid warfare has been defined as "actions by a sovereign state to demoralize, disrupt or destroy another sovereign state through the means of the cosmic environment and the redirection of otherwise natural celestial hazards." Asteroid warfare is typically described as the use of asteroids as kinetic weapons against planetary environments, and are considered the most devastating form of planetary warfare.

Asteroid warfare, after its extensive use during the Krogan Rebellions, was declared a war crime under the Citadel Conventions.