This can be anything from Hyperspace in Star Wars, Warp Drive in Star Trek, travel through the Warp in Warhammer 40k or anything else.
I’ve always liked “slow” FTL travel, where going a few light-years still takes a few days or so. I also really like travel through an alternate dimension like in 40k, Event Horizon, Witchspace in Elite Dangerous.
I wanna know your favorite versions, or do you prefer stories that obey the laws of known physics, like the Expanse or Rimworld?
Slipspace from Halo.
You can weaponize that shit in a pinch if you wish. It seems to be the appropriate FTL method for humanity to use.
Tbf, you can weaponize a lot of methods of FTL in a pinch.
In Mass Effect their guns literally work on the same fundamentals as their FTL, just scaled down.
40k’s Warp… well, it’s where Psykers get their power from so every space wizard is kinda weaponizing FTL at all times if you squint. The warp itself doesn’t need weaponizing, but you probably could.
Stargates just sort of… disintegrate things that are in the way when they open. I can’t remember an instance of them weaponizing that, but I’d be shocked if it never happens.
The Stargate device has been weaponised plenty. The best one being in a satellite shooting a high powered laser from orbit.
I gotta argue that the best one was dropping a Stargate into a star to make it explode and take out a solar system.