Add the user action "Use Ancient Transportation Network" and the extra "Ancient Hub" to sandbox. "Ancient Hub" are placed on the map before the game starts. A unit can do "Use Ancient Transportation Network" when located at a tile with an "Ancient Hub" and targeting a tile with an "Ancient Hub". An "Ancient Hub" becomes visible when Polytheism is discovered. It becomes possible to pillage an "Ancient Hub" after that. It becomes possible to use it once the player discovers Polytheism. The action has unlimited max range. It isn't possible to build an "Ancient Hub".
Targeting unseen tiles
A target tile without an "Ancient Hub" will lose the unit hit points - potentially killing it. A target tile with an "Ancient Hub" the unit can't exist on - say a land unit ending up in the sea or a ship ending up on land - kills the unit.
Add the user action "Use Ancient Transportation Network" and the extra "Ancient Hub" to sandbox. "Ancient Hub" are placed on the map before the game starts. A unit can do "Use Ancient Transportation Network" when located at a tile with an "Ancient Hub" and targeting a tile with an "Ancient Hub". An "Ancient Hub" becomes visible when Polytheism is discovered. It becomes possible to pillage an "Ancient Hub" after that. It becomes possible to use it once the player discovers Polytheism. The action has unlimited max range. It isn't possible to build an "Ancient Hub".
Targeting unseen tiles A target tile without an "Ancient Hub" will lose the unit hit points - potentially killing it. A target tile with an "Ancient Hub" the unit can't exist on - say a land unit ending up in the sea or a ship ending up on land - kills the unit.