The evil Floogen had put an invisible barrier on the Tower. I sent in some mages to destroy it. You're free to eradiate the Floogen from the forest now.
Additionally, the swamp now dyes you purple as a nice visual flair.
patch 4
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.