I completed it earlier (save for some silly patterns for gnomekindle which I lack). Its the lair at the bottom of the dralk pit under the floaty lair, and it is named "The Forge". The owner is Runos.

In this lair all of the t6 machines are available. The craft area in the upper section is open for public usage, so you can go ahead and make use of the machine storage & silo storage. You will however not have access to anything underneath as that is Rune's personal space.

When using the lair, remember not to disturb other people's resources or steal/delete them without asking first, and please clean up after yourself so others may use the space when you are done.

Happy crafting, order!