Lind spent the better part of the year setting up his new Emerald Haven. It was easily as large as the Frey Clan personal courtyards! He had room for 6 laboratories at least with space to spare for storage and even just a treasury if he wanted!
The one catch, however, was that while he could finally enter, he could not close the door behind him. Only the key could do that. It could not enter anymore than he could before.
Haro had tested for him that the space could be locked from the outside but not with him inside it. All that happened was the key created a kind of plug to block all senses at that time yet Lind could then open it from the inside.
In other words, anyone looking for him would find at best a shimmering emerald ward with the circular key at its heart. It would not take much for a cultivator to unlock it as the artifact was already too complex just to become the anchor for the space.
