Which in turn lets you into the northern parts of this level... and the hidden down-staircase in 6N, that leads to the otherwise inaccessible chamber in Lava Gates: 3N.
×which then lets you kill that golem, "
complete"
the room and toggle its green doors, allowing you to come back to it via the conventional entrance and head north into the other part of "
Lava Gates"
.
Click here to view the secret text
×So what we've basically got is a triple lock - a room on level 2 that can only be cleared from level 3, a room on level 1 that can only be cleared from level 2, and a room on level 3 that can only be cleared from level 1, and they all need to be done.