|The bone pile trap.|
Some of the bones in the pile began to come together and rise up as skeletons. I wasn't initially concerned and simply focused on trying to conserve resources while taking down these simple guardians, but more the things joined the fight soon enough. I initially thought it might be just skeletons we hadn't seen right off the bat, but then the shadows started flickering out of the edge of the light cast into the corners and a more dangerous skeleton started firing cursed arrows down at us.
According to what Wendylly found, the Abolist hadn't made the tower, he'd simply found it and assumed it was one of several lost mage towers that had belonged to some long gone mage of great power but little to no historical importance. The journal also spoke of the last few hundred members of the orc tribe whose souls and ashes went into the curse and what became of their bones after their flesh was burned away, explaining the origin of our infinite undead trap below us. Which, by the way, we had eliminated by destroying the magical braziers. That'll leave a trace for our enemy, but perhaps that will work to make them cautious and slow them down.