Hello all, looking for a little insight into the 9th level Wizard spell Gate. Specifically the line "A gate has a front and a back. Creatures moving through the gate from the front are transported to the other plane; creatures moving through it from the back are not.". For my scenario we need to assume the following:
1. A powerful lich has previously used a Gate spell on the entrance to their catacomb
2. The Gate now connects this entrance to their demiplane
3. The feat Create Wonderous Item was used with one or more Wish spells to create a sort of one destination stargate that is implanted in the hallway so as to be hidden
4. The spell is now in permanent effect
What I am most interested in understanding is the characters go into the catacombs and either clear it or reach a point of retreat/needing to resupply. At this point, they back track to the entrance and find themselves standing outside the catacombs, in a small clearing similar to where they indeed found the dungeon, but 10'-15' beyond what could be seen from the doorway is the demiplane of the lich and not the relative safety and freedom they expected. Would characters entering the dungeon notice that they have gone through the "back" of the gate? What would the front appear as? Is it like a looking glass, so that the illusion beyond is enough to leave anyone taking a quick glance back none the wiser? Would it be possible to create a permanent connection like I am stating above to a smaller fixed location such as the plane using Gate? Thoughts and assistance rounding this idea out are very much appreciated. Many thanks!