I created a Lux Transformation cheat sheet for you guys

http://i.imgur.com/PUQFMXh.png

If how to get Dark Form is confusing, you just need to Fuse Water and Fire or Fuse Earth and Air Also if you can't read some of the lighter names the names of all the forms are (going clockwise) Fire, Magma, Earth, Mystic, Water, Ice, Air, Storm. and at the Center is Dark