Transfiguration - a complete change of form or appearance into a more beautiful or spiritual state. The Darkness takes the form of whatever the wielder wants. " It (the Witness) gives Darkness a wicked shape." - Savathun Oryx called himself the King of Shapes. If you think about it the Taken are basically an example of Transfiguration. The heart of the black garden Tranfigured three vex statues in living vex. The Darkness is about shaping. The dark relic we use for crafting uses the words "shape" and "reshape." The final D2 expansion is called final shape. The nightmares aren't ghost. Eris had a nightmare of Toland, but he was not dead. The nightmares simply take the shape people you know using your own consciousness. During the The Witch queen communion mission the Pyramid reacted to are presence. You could say was changing shape. I believe transfiguration is the final element as shaping is connected to consciousness. Plus the definition sounds religious just like the Witness. So what about subclasses? Use transfiguration to summon fiends/spirits, transfigure enemies into relics of the past (hive sword/scorch cannon). Use your imagination. Guardians supers transfigure you into monsters. Warlock - Grim Reaper Hunter - Fenrir, Odin's Bane Titan - Goliath