Moved obelisk can destroy buff beam (Windows)
The mystic's Obelisk can destroy your own buff beam by moving it during a wave.
how to reproduce:
get in any map and place a obelisk between a buff beam.
start the wave and move the obelisk
the buff beam should be destroyed.
Probably by design in DD1 if an item was destroyed on a buff the buff went too. The buff beam sees the tower as gone so is deleted.