On and off states.
A large field of 20 x 20 Scrapyard Lights will appear in the Scrapyard in Ulduar, after activating the Rusty Lever. The goal is to make the lights match the sigil of Mimiron. This activity is part of the puzzle for obtaining the 
[Lucid Nightmare].
Patch changes[]
Patch 7.3.0 (2017-08-29): Added.