Doom is now open for those interested. To enter the dungeon you need to contact a GM. Each player needs to pay a fee of 200'000 coins with no refund.
This is meant to be a top dificulty/reward dungeon for those seeking greater challenge, but keep in mind that, there are only 2 ways out, either dead or using final lever. If you find some other way then its a bug and should be reported.
Make sure you have plenty of time to run through it since we won't be taking that as an excuse to let you out.
It is plain simple actually, a matter of survivall.
Good luck.
Argon