Amaterasu

Amaterasu (Goddess of the Sun)
Ninjutsu (Katon; Requires Mangekyou Sharingan (a)) [Fire, Uchiha Kinjutsu]
Rank: 10 (A-Class);
Range: Close (10 ft. + 5 ft./2 extra chakra);
Effect: Consumes 1 target or object in a burst of flame/round;
Duration: Concentration (up to 1 round/2 extra chakra) plus 1 round/2 extra chakra (see text);
Saving Throws: Dex half and Dex partial;
Chakra Resistance: Yes (see text);
Chakra Cost: 12.

This legendary technique draws the innate powerful fire energy in the wielder of
the mangekyou sharingan and brings it forth in a burst of black flames. The user can target up to 1 creature or unattended object per round with this technique, with which he must have line of sight.

Each burst of flame deals 200 points of fire damage, which can be halved with a
successful Dex save. On a failed save, the target also catches on fire for 1 round/level or the number of damage die dealt by a burst of Amaterasu (whichever is lower). The DC to put out Amaterasu-level flames is a Dex save (DC 25). It cannot be doused by normal water unless it was created or manipulated by a creature with at least 12 ranks in the Ninjutsu skill (by means of a Suiton technique), but it can be sealed by the Fuuka Houin technique.

If a burst of flame was fired near a surface, a 5-ft. square of the surface will catch on fire, dealing half the damage of the original burst of flame to every creature and object that comes in contact with it. The fire will not spread and will burn until everything within is consumed.

After using this technique, the user gains 1 point of mangekyou sharingan blindness. See Mangekyou Sharingan for details on blindness. Every 2 rounds after the first that the user concentrates on this technique, the user gains 1 point of mangekyou sharingan blindness. The user does not need to maintain the Mangekyou Sharingan to concentrate on this technique.

The user adds his sharingan eye bonus to Int checks made if disturbed while concentrating on Amaterasu. No single creature can be targeted with more than 3 bursts of Amaterasu per use of the technique. Each consequent burst of Amaterasu refreshes the duration for which the target will be caught on fire.

This technique can only be learned if selected by the user when obtaining the Mangekyou Sharingan. The character gains a +4 bonus to checks to overcome chakra resistance.

Empower
The user may spend an additional 1 point of Chakra to increase the damage dealt by one burst of flame by 10, up to a maximum of 50. This process must be repeated for each burst of Amaterasu.

The user may spend an additional point of Chakra per burst to increase the save DC by 1 (maximum +3 for 3 chakra). This increment does not apply to the DC to put out the fire left by Amaterasu.

Mastery
Every step of mastery in this technique allows the user to ignore 3 points of fire resistance of any target caught in his Amaterasu. Fire immunity is not affected.