Each of the gems (Amber, Obsidian, Emerald and Sapphire) have different powers when used in the cane. Dark is getting ready to have some fun with them one by one. By the looks of your profile you either can't or choose not to be able to see anything not rated as general. The rest of the sequence was rated as Explicit (although most would probably have been fine as Adult or Mature, I err on the side of caution these days).