Seeds like a dilemma. When encountered, place on far end of
spaceline. (Not duplicatable.) Destroys all ships present; place
personnel aboard (or on planet here) under doorway (they
are in play). End of every turn, moves one location toward
opposite end. At end of spaceline, place on table. At any time,
any player may relocate their personnel under here to any
planet (even a time location). (Immune to Revolving Door.)