A portion of the path is like a small maze that divides the crucible. From Zenetta walk back down the main road a short way and there will be a ramp on the left side. There are about 3 or 4 twists and turns to make before you come out on the other side. Then once you are back out on the street stay towards the left and the tower is a little ways up on the left side. It should be visible on your map once you are near it.
The tower has about 5 or 6 levels and you may want to bring help.