Gateways allow minions to heed your call from the Underworld, and heroes descend down into the Underworld in their feeble attempt to thwart the forces of evil. The Gateways in this realm are linked together, left over from a long-forgotten age where gods walked the realm and fought endless battles for the lands of the Overworld.
The Gateways also link to divergent lands and realms where no man or beast has ever set foot or set eyes upon, it is in these lands that nightmarish creatures stalk one another in an endless game of predator and prey... a skilled Underlord would, perhaps, be able to entice these unnamed horrors to their dungeon and use them to their own gain.
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Underworld Gateway
Overworld Gateway