Originally posted by Hammer:

While Building a massive wall around future town, a normal looking skeleton started attacking my wall, no stars just normal skeleton with a stick.

It hit structures for over 100 damage, and almost killed me in a single hit (I have roughly 150 hp to start).

It had tons of health, on par with a 1 or 2 star troll, and upon death dropped about 514 bones and a single skull. I had to finish it with arrows by the way since it crushed through my blocks.

What... the heck... created this beast or what would cause it to spawn?

Are you using mods and or other things beyond default game play and settings?