This glitch allows you to get your Memory Residue (MR) back that you used to buy an ACCESSORIES (works on accessories ONLY). First you need to have enough MR to buy an Accessory, after that SAVE your game, then go to where the shop is and buy an ACCESSORY. After buying find an area with enemies or traps and let your character DIE, then retry the zone. Now you will notice that you have all your MR back just before buying the accessories. Quit the game and go to Character Options and check your Accessories there you will see that you have the accessories you just bought from the shop but got your MR back.