Did you play Oblivion, it had gates like this that randomly opened in there dynamic evolving worlds?
Problem there with theirs was that all the gear from in plane, over there, severely gimped the experience gain progression, over here. Slip the noob thru the hole bait some nasty thru, have the guards kill it, then loot and gear up with penultimate weapons. Then slip it on, and hack and slash, right on through the game, earning easy fame and fortune.
Something which would be easy to avoid, I would think, but a company as big as Bethesda wasn't able to avoid debunking their own experience progressions, thereby ruining their content, or DLC, similar issues arise in that very popular postapocolyptic game, that I can't seem to remember the name of. The bane of any RPG, gear. Sincerely, Knutor