Drop the sun aka the great fireball in the sky

You have decided that ultimate destruction shall occur on your enemy. To do this you decide to drop the sun, or otherwise known to some as the great fireball in the sky by opening a portal to another world or dimension. This attack seems to take the form of a mushroom as the explosion occurs. The explosion may also leave behind some... possibly... probably dangerous effects in the area. You may even get to do this twice so enemies of the user be warned don’t destroy their property... especially if it’s a ship.