GLITCH IN TIME NPC

i had a idea for a npc you go to the khaos realm (aka the place to find alpha) but instead there is area
which takes you go in a room filled with cracked walls and blood and a npc there called GLITCH IN TIME
so you click it and it teleports you to a blank room with a dead tree in the middle and a message appears
saying (the white space shows the dark side of yourself) then a completely shadowded version of your character
appears same stats same attacks but it can vanish and reappear so after you defeat the boss it brings you back
to the room where the Glitch in time NPC was but a message (will say you wake up on the floor not knowing
what just happened) good idea right