This may have been asked before, but when the barrier: Skeletal Horde is played and summons Ancient Skeletons to all open locations do they give a chance to close the location as per usual henchman rules? Thanks for any response.
No. Summoned henchman don't allow you to attempt to close "this location" because they don't come from "this location."
Rulebook v3 p12 wrote:
If the summoned card is a villain or henchman, defeating it does not allow you to close a location or win the scenario—ignore any such text on those cards. Summoned cards are not part of any location deck.