Nicoll-Dyson beam

James Nicoll first proposed this laser as a weapon where the satellites of a Dyson swarm surrounding a sun act as a phased array laser capable of delivering an energy payload to a planet-sized target millions of light years away. This could destroy an atmosphere or the entire planet depending on the focus of the beam, the intensity of its source sun, the size of the swarm, and the time taken to build up the energy before release.

Non-lethal uses of such a device could include propelling laser-sail craft interstellar distances.

While the Shkadov thruster runs off similar principals, its usage is to move the sun rather than release its energy at a distant target.