First run into Merga Wraith
I started a new character and gave him melee. I thought to myself "right, first thing is first, let's make a spear". So I found some glass but no string. I ended up using my necklace/amulet to make the broadspear. I hadn't read about Merga Wraith yet and so you can imagine my surprise when he showed up to kill me. Because I had the spear and was strong, tough and had melee I thought I could take him. Turns out I couldn't.
So I restarted my character thinking "well that was odd, must be a random occurrence." This time I had two spears. The second one I had to use the necklace again. Of course, right when I made it there pops out Merga Wraith. This time I just bolt and retreat successfully. As I retreat away a few hexes I see Merga Wraith if following me. He catches up. This time I throw one of my two spears. Hits him but does no damage. So I start to flee but I fall down and get killed.
I thought to myself "Well f* this noise. I guess the game can't deal with me having a spear so early in the game and so it sends Merga Wraith after me for being awesome." So I created a new character, with hide, botany, mechanic and medicine. I make a sharpened spear. "Ok, good, no Merga Wraith." At night I get hit by a bandit with a gun. In the scuffle I get shot but I escape. But I'm bleeding a lot (luckily I had some bandages from the cyro crib). I hide to rest up but another bandit finds me. I fall over trying to get away and the bandit catches up. Gives me severe pain and a concussion. I stab him with the spear and it falls apart so I give up. Now I'm bleeding heavily and almost dead, with no clothes, weapons, water or food. But because I gave my necklace to the bandit who shows up to brighten my day? Muther F8cking Merga Wraith, who proceeded to grasp my brains out.
After that I got on the wiki to see what this thing was. And yes, I felt dumb when I realized just why he comes after you.
Just out of interest: What was your first run into Merga Wraith? Did you know about him beforehand?