So, I found a boarded up house in the woods near a road, and found some kind of terrifying phantasmal monster in there that keeps flinging bits of itself to attack me. It’s a Wraith. If you know what it is, then please don’t post any suggestions here. I only want to hear from other newbs fumbling through the dark here 
I tried shooting it a bunch with wooden arrows, but that hasn’t seemed to affect it much. The thing didn’t seem inclined to come out into daylight, so I just left.
Thing is, I feel a bit guilty about letting yet another Unspeakable Horror loose upon the world, and I’ve skilled up quite a bit since then. I have a pretty decent shotgun and I’ve added a flamethrower to the thing. I know how to make some bombs and stuff. I’m thinking I should fix this problem that I accidentally freed.
So, I’m looking for suggestions from the perspective of people who would be equally clueless about fighting the thing. What else could I try to bring it down with?
I’ve got this image in my head of showing up with a carload full of tricks to try, standing outside during the day, and trying everything I can think of.