Mount Nantai's Caster History
Here's where you can find out all about Gene's Caster. True, other sites have brought you the simple facts, but here's the only place on the web where you'll find a list of every shot Gene fired from his Caster, and what shell was used.
Also, in other words, if I see any of this on another site, I'll know it's been taken from my site.

For each shot, I'll list the episode it appeared in, the shell's number (if it was said) and the effect the shell had.
Episode                                  Shell # and color                         Effect the shell had                          
1. Outlaw World                      3, red in color                           red/orange beam, shocked then exploded.

2. World of Desires                  5, color unknown                     red beam, black & white shock, canceled
                                                                                            by Tao spell.

-------2------------                    19, red in color                        the shell was a dud

5. Beast Girl-Ready to Pounce   12, silver in color                     blue ball, fries Aisha

15. The Seven Emerge              number unknown                    blue & white explodes on Shimi's light shield

17. Between Life and Machine   number unknown                    red/orange beam. Electricutes Ron's robot.

-----------17-----------------       number unknown                     -----same as above

----------17-----------------        number unknown                     red/orange beam. Canceled by Ron's Caster.

-----------17----------------        number unknown                     -----same as above

----------17-----------------        red in color, number unknown    ------same as above

21. Grave of the Dragon          red in color, number unknown    blue beam...effect unknown

----------21--------------           number unknown                      close range shot at Harry in robot suit.

23. Hot Springs Planet Tenrei    number unknown                    blue beam, broke window at Nyoti temple.

25. Maze of Despair                11, color unknown                   red/orange beam. Canceled by Hanmushi's Tao spell.

------25---------------               10, gold in color                      red, canceled by Hanmushi.

------25--------------                12, color unknown                  red/orange, canceled by Hanmushi.

------25--------------                4 or 13, gold with kanji            black ball, absorbing Hanmushi.

-------25-----------                  9, gold with kanji                     black ball, knocked Ron off Leyline.

26. Return to Space                4 or 13, gold with kanji            black ball, absorbed Lord Hazanko.

---------26----------                 4 or 13, gold with kanji            gold beam, canceled by Hanzanko's Tao spell.
Caster information from episode 23:
In episode 23, Gene tells the wizards on Tenrei that he's seen 20 different types of Caster shells, but he's never seen a 4, 9 or 13. As Ark, the wizard, tells him, those 3 can only be made by him and the other two wizards, Urt and Hadul. Ark and Hadul say they'll give Gene the 9 and 13 shells he wants if he goes to Mount Nyoti and shoots a video of what Urt is doing over there, and if possible get some "dirty" footage of her. Once Gene gets there he ends up playing ping-pong with Urt and winning two number 4 caster shells from her. Then he tells Urt what Ark and Hadul want, she says she'll shoot the film herself. She gives Gene the video camera and he returns to the temple on Mount Nantai. After giving Ark and Hadul the video, they each give Gene one shell, one 9 and one 13. They warn Gene though, that since the power used to make the caster shells is weak, a catalyist is needed, namely, the life-force of the person who fired it. "So no mutiple discharages?" Gene asks. "Right, just like...you know." Hadul answers.
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