The Tree

The urban infrastructure that makes up most of the inhabited areas of Tier One leads, through a series of hard-to-find passageways near the center, to a natural rock formation in the shape of a partial dome, surrounded by girders and pipes. Natural cave tunnels lead into that rock formation and open into an amphitheater with a stone altar in the center and raised chambers, something like "box seats", overlooking the altar.
Beyond the amphitheatre is a large door, which opens into a huge open area; this area has the first contact with the natural soil of the planet one is likely to find beyond the outer walls of the Hub itself. At the center, and rising up to the top of the partial dome and to the air beyond it, is a large, petrified tree...
The Tree is a Force Nexus on Nigita. It is believed by the Harmonium that the Tree is what has caused so many Force sensitives to gravitate towards the planet in the first place.
The tree itself is large and made of white, petrified bark. The area is quite calm, and kept clean by the acolytes of the Harmonium as well as its members. Leading into the area that the tree occupies is a large chamber with something that was once an altar, and above the altar is a ring of small rooms that appear to have once been viewing boxes. When the tree was first discovered, the altar was tainted and had been used for sacrifice, but the taint on the altar has since been removed.
The tree is a powerful source of force energy, and increases the Force rating of Force sensitives on the planet Nigita by one while they remain planetside.