You would think that i could show you things and you could just shoot them but sometime the enemy is within...
However lots of things are not inside you, here is where you can read up on them!
Humans[]
The most filth, evil, monsterous enemies that have ever roamed the stars.
Covenant[]
They don't look like you, shoot em
Prometheans[]
The AI have come to kill us, AND WE DID NOT MAKE THEM