Guide:
The Tower grows roots in the center of the sewers. There are six sewer entrances you use to reach this part of the town’s underground. You can use any of them to enter the sewer and just head to the central part, the largest circular room called Barathrum Centrata.
Unlike the previous 12 shards, you might get killed on your way to this one. Be sure you haven’t died recently, just so you can resurrect on the same spot, without being teleported to another location. This is due to the large number of enemies in this area. Someone might think it is understandable, as we are so close to the “deepest depths”.