DYSMANTLE

The Gatekeeper is the first boss monster you come upon in the gated tutorial area. He is all the way to the east by the exit and must be killed in order to progress. He spits out toxic barf that will damage you if you stay in it and it also lingers on the ground for roughly ten seconds. He is pretty easy though, I was level 4 and after thorough gathering, my crowbar was level 3. Wait for him to spit, use charged attack and then strafe around him.