I just start messing with Epic spells, and decided to make my own spell based on Itachi/Sasuke's Amaterasu from Naruto. I would love some feedback on this spell from Naruto fans! Anything I could change, do better, etc...

Amaterasu
Evocation [Fire]
Spellcraft DC:57
Components: V
Casting Time: 1 action
Range: 300 ft.
Area: 10-ft.-radius emanation
Duration: 20 hours
Saving Throw: Reflex Half
Spell Resistance: Yes
To Develop: 513,000 gp; 11 days; 20,520 XP. Seed: energy (emanate 10d6 fire in 10-ft. radius) (DC19). Factors: increase damage to 10d6 (+16 DC), 1-action casting time (+20 DC), no somatic component (+2 DC), dismissible by caster (+2 DC). Mitigating factors: 2d6 backlash (-2 DC).

You summon unholy black flames that are said to be as hot as the sun. Upon speaking the command word “Amaterasu”, the creature or object you target emanates black flames to a radius of 10 feet for 20 hours (or until the caster dismisses the spell). The emanated fire deals 10d6 points of damage per round against unprotected creatures (the target is susceptible if not magically protected or otherwise resistant to the energy). The strain to maintain the spell causes the casters eyes to bleed dealing him 2d6 points of damage per round while the spell is active.

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