Metal door next to chess puzzle?

[Wisak]

How do you open it?

[Doombringer]

Generally via Tomb or Well after you light candle circle.

[Wisak]

I have done 80+ runs and haven't gotten tomb once. :(

[Doombringer]

You can drain the well while you have the basement key and get to the same place underground.
(The tomb part will be blocked off if it isn't your outer room though.)
Until you do so the elevator isn't that useful.

[Slime Q. Slimedog]

Originally posted by Wisak:

I have done 80+ runs and haven't gotten tomb once. :(

That’s rough, it shouldn’t be so hard to get. Maybe wait to draft the outer room until you’ve got a die or two, so you can reroll for it.