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Particle beam. Stuff that kills people but not buildings is either a toxin/bioweapon, or mutagenic radiation. Not much prospect for gassing them from orbit so that leaves the radiation. Which might …

Other races are very nourishing. Your super weapon is "made to devour other races". I take devour to mean eating them. There is a lot of food energy in other races, whom themselves have reproduced …

Turn down the sun Your aliens add material to the sun intended to quench fusion. Less fusion slows down entropy. It has the added benefit of chilling the planets and stopping life processes. Shad …

Unravelling God's stitches. https://www.deviantart.com/art/Rift-463670599 After the war, the rebuilders needed energy. The old sources were exhausted. But there is energy at interfaces, and it w …

No need to construct. You can have it for free. https://en.wikipedia.org/wiki/Iceberg_B-15 Iceberg B-15 was the largest recorded iceberg by area.[Note 1] It measured around 295 by 37 kilometres (15 …

Time dilation device. I lifted this scifi concept from Stargate. It works for your purposes and offers narrative possibilities too. http://stargate.wikia.com/wiki/Time_dilation_device The Ti …

In gravity simulators, you can crash moons by flying other bodies very near them / slingshotting around them. The gravitational attraction of the passing smaller body can slow the moon enough to dest …

Particle beams are a nice clean way to eradicate life forms. Neutrons are uncharged particles and so will not be blocked by a planetary electromagnetic field or shields relying on that sort of thing. …

Humanity is not as smart as it was. Homo sapiens has existed as a species for 300,000 years. It took 290,000 years before members of our species domesticated the animals we like to eat, and another …

The idea of satellite defenses to render nukes useless is a good idea. And not a new one. Strategic Defense Initiative Redux. 1983. It was a plan that read like science fiction: A system armed …

A superdense piece of neutron star hitting the earth would accelerate down to the core and then out the other side. If it were not going too fast to escape back into space it would turn around under …

You give the answer in the OP! Q: How could an advanced civilization turn a star into a black hole? A: with the help of special equipment that utilize rare dark matter. You have your dark matter h …

Messing with magma accelerates plate tectonics. http://theconversation.com/magma-power-how-superheated-molten-rock-could-provide-renewable-energy-67725 Fracking is the injection of soapy water and …

Combatants are big. https://maroonersrock.com/2020/07/ultraman-day-10-shows-and-movies-to-ease-into-the-franchise/ Giant combatants always battle downtown! I used to work in Angel Grove, California …

Hugbots. Your nano machines trundle out and hug opposing forces and machines. They just glom on and stay. They do not otherwise damage the thing. They are pretty durable. If you peel one off and i …