I was experimenting with the costumes and discovered that while a vendor will hold the "costume" they won't wear it. If you try to equip a costume while in wraith form you drop it. While wearing the bloodworm costume if you go to war mode the mouth "tentacles" shoot out farther. I know it was probably mentioned by the Hag, ( i.e. take damage ), if you step on a trap, and take damage you revert to human, AND even though I turned back into the monster form the liches targeted me, and I was in a heap of trouble. I ended being poisoned and wouldn't stay in monster form. You can affect the RNG, if you WANT blue crystals you get red and yellow, if you want red you get blue. LOL The book states that the blue crystals cure ANY disease or illness? I wonder if they might come on handy in the future? I might have to save a few. You never know when Mad Mongbat Disease might become pandemic... I'm getting a little tired of the quest, and I'm only up to 25 blue crystals.