So, I was just meandering through a swamp today and stumbled across what I thought was an odd-looking tumble of roots. As I approached, said tumble of roots began to move violently and gave chase. I lobbed a few arrows at what was entitled "Abomination." The arrows had little effect and it continued to chase me until I found shelter in a crypt. When I emerged shortly thereafter, it had disappeared, but I did come across two others on my journey through the swamp. What is this devilry?