How to easy kill The Marauder

This is The Marauder, serious guy, who can kill you iif you won't defend.

Ballista, the best gun in Doom, what has much damage, and ammo

The gun what you have in Cultist Base, The Revenant will give it to you.

So, when you trying to kill Marauder, you can die when you doing this at first time, to kill him easy you need: Ballista (orange gun), and super shotgun (he looks like a basic shotgun, but has a second muzzle).
You should wait until his eye become green, shoot him with Ballista, and after shoot him with Super Shotgun. Also don't forget to Dash(shift or other button you bindeed)