Agreed I killed it on my first go with a fully upgraded Finewood Bow and probably at least 50 Fire Arrows and plenty of time. I was initially really concerned when I saw this massive stumpy Stranger Things look alike emerge from the ground.

Luckily it doesn't seem to like hillsides and certain clumps of trees, definitely kill-able but very tanky. Hopefully this thing will never be implemented to raid bases, except for in its natural biome.