The Spire is a metaphysical construct that appears as the tip of a spire poking from the ground. At night, it emanates an enticing chorus of instruments that lures living creatures towards it. When contacted, it transports the creature to a pocket dimension that is controlled by The Old Man.
The Spire consists of various floors which lead to one another with rather unorthodox means, ranging from doors to blasted holes in walls that reveal black voids. It is unknown how many floors there truly are and if the order remains the same.
As seen during The Symphony of the Trees, the man controls living creatures like a puppet master to do his bidding, which was deduced by party in the oneshot. It is theorized that when a creature is on the verge of death, their body is seized and is turned into a puppet for the man to use.
In the oneshot, The Spire was located near the now abandoned village of Brunswick within the jurisdiction of Vollachia. However, it dissapeared towards the end of the oneshot. The party involved was left with a compass that appears to point towards a definite direction.