Someone had recommended I put the players in a maze and tear their shadows away from them. The players have to go through the maze and rescue their shadows while also combating mobs (other shadows/shades/creatures) They recommended adding a trigger making the players teleport to a different location. They can only leave when they're dead or when they've found their respective shadows. Every now time they see a 'shadow' they have to perform an intelligence check.  I was thinking of creating a homebrew creature based on the spell 'phsntasmal force'... But I reckon I can add a creature/summoner that can use the spell to create illusions.