Gahreesen Wall

The Wall, inside the main tower in Gahreesen, was used for training members of the Guild of Maintainers. It is a large climbable wall, with shutters that activate upon climbing onto them, throwing you back down to the base of the wall. The shutters can be set on two systems, each setting up shutters for the opposite side of the Wall.

The training was probably done by two teams (Yellow/North vs Purple/South) both setting up a 'maze' for the other. The trick was to remember where the shutters are and try to get to the top of the wall before a member of the other team does.

Upon reaching the top of the Wall, you are linked to a special Maintainers version of the Nexus. How exactly this was done, is unknown.