Solar Smash Weapons
When ruining a planet, simple guns won’t do. You need something more serious and threatening to cross the zero-gravity space and tear atmosphere layers. Fortunately, you’re in no need to invent—all the powerful Solar Smash weapons are at your disposal.
Would it be a drill, a black hole, or tentacle intruders from another dimension? Hit the Earth with its own moon, smash it with an asteroid hail, and spectate the population increasingly decreasing.