Where is the Lightless Passage?

I was just having some fun with a new char in the Standard League, desecrated an item with materials I had from 0.3, but when trying to find the Lightless Passage it simply does not exist in Mastodon Badlands. The cave actually exist, but it is just not possible to enter it.... How will I reveal the desecrated mod?

It's not in standard yet, will be on friday after the update.

So the desecration will remain unrevealed. I mean if that's going to be Standard only on friday then don't allow me to use the item...