I could see something like plant growth for all rangers, with some heavy restrictions:
Lag like sanctify room (means the ranger is out of camo and lagged out for several ticks).
Causes any non-wild mobs in the room when you cast it to be aggro.
Long cooldown timer (100-200 hours)
Can't be used in a protected city.
Definitely not auto-home terrain though. Don't think that would be OP, probably not even something you would use often. But it could open up some options.