Psychic powers: Those who earn (or steal) an Imperial psychic amplifier can use their mind to manipulate and defeat their foes.
More detailed information on using each individual weapon can be found on their respective pages. But with so many mods, it can be tough to figure out which to choose. Burst down with high-DPS weapons when unsupported. A versatile gun that works at long ranges while still dealing satisfactory damage at close-medium range. Spread your fighters apart to reduce potential damage done each shell.
Distract them such that they fire far away from any structures. Those are what I feel are the 14 best mods in RimWorld for enhanced gameplay.