Dragon Fang is the initial Overdrive ability for Auron. The input for it is ( in the Japanese and North American version). When successfully input, it will delay all enemies' turns. It is a Rank 5 ability.
Dragon Fang deals physical damage to all enemies, and temporarily lowers their Attack by a large amount. It's exclusive to Auron, requires one Soul Gauge to use, and is obtained via Shimmering Blade (X). The animation is similar to the original, Final Fantasy X version, however, Auron leaps to the middle of the screen, as opposed to simply jumping straight up, before slamming his blade into the ground.
An improved version exists as a Limit Break Soul Break: Secret Dragon Fang. This variation deals five massive physical fire attacks with 100% critical hit chance to one enemy. It deals more damage depending on the amount of Limit Break Gauge consumed, ignores Defense, and can break the damage cap. It's exclusive to Auron, and can only be used once per dungeon.