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Worldbuilding

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    $\begingroup$ Re:4. - To push it a step further, if you can bioengineer one kilometer high Kaiju shooting lasers from their eyes, then you can probably also include a convenient kill switch in the design, just in case you ever need it. Maybe there's a blood vessel in the Kaiju's brain that bursts if it happens to be exposed to sound at a specific frequency, maybe the one disease that can kill it is the equivalent of common cold from your planet, etc. As a bonus, this kill switch could lead to interesting plots if the earthlings ever learn of it (cf. War of the Worlds, Signs, etc.) $\endgroup$
    – Jakub Konieczny
    Commented May 24 at 23:15
  • $\begingroup$ Sort of hinted from 3. and 4., but might be worth its own point; they allow some level of plausible deniability. If Humanity, or another alien species you're at war at, claims you violated the Prime Directive by interfering with Earth, the Kaiju using aliens can just say "Godzilla wasn't us - Godzilla must've been awakened from the aftereffects of the nuclear bomb experiments the humans did! I bet if we looked into it, Godzilla was always there to begin with.". $\endgroup$
    – Alexander The 1st
    Commented May 26 at 2:30
  • $\begingroup$ Thank you for reiterating how throwing asteroids isn’t as easy as people make it out to be. You have to be exact with how you aim the things and give it a lot of oomph to go in the right direction and the right asteroids within a reasonable timeframe aren’t that available. But the target planet on the other hand can launch one nuke, laser vehicle or just a single shuttle/space vehicle into the asteroid and it’ll likely miss the planet, forcing the attacker to constantly protect the asteroid and do course corrections. This is actually where you can make compelling storytelling, defending rocks $\endgroup$
    – Demigan
    Commented May 26 at 16:44