very simple idea to allow players to warp back to a dungeon after completing the main quest for it, so before you do the quest you can't warp but let's say after you complete jungle dungeon quest you unlock fast travel for it somewhat like an rpg game, for example, skyrim, allows you to fast travel to places you discover but this still keeps the 'extreme' factor into it as you have to do a quest dedicated to said dungeon before unlocking fast travel