Eight Magic Color Selection Crystal (八色魔選晶, Hasshiki Masen Shou) is a Magic Tool used at Magnostadt Academy for classifying the eight different kinds of Magicians and Rukh in a person. The kinds of rukh are:
- 1st type: rukh that manipulate flames
- 2nd type: rukh that manipulate water
- 3rd type: rukh that manipulate light
- 4th type: rukh that manipulate lightning
- 5th type: rukh that manipulate wind
- 6th type: rukh that manipulate sound
- 7th type: rukh that manipulate power
- 8th type: rukh that manipulate life