Livelock

You're most likely to acquire this very early on in your gameplay. For a quick rundown on the enemy types I'd peep this from Gamepedia: https://livelock.gamepedia.com/Enemy_Units

And then there's also the fun little lore bit about The Abaddon from Arc Games: https://www.arcgames.com/en/games/Livelock/news/detail/10089...

Here's also a video guide showcasing the T-100 killstreak achievement you may want to pair with this if for some reason you got that far without it coming naturally, by YouTuber "Markyshizzle."