Iron Dragon's Scales! (And Body...)

Skill Name: Iron Dragon's Scales. (And Body...)
Rank: D.
Bonuses:
D: At this Rank, Gajeel can morph his epidermis into iron that resembles a dragon's scales. These scales are impenetrable by Kunai, Shuriken, Swords, and Spears. Impenetrable by D Rank Jutsu.
C: At this Rank, Gajeel's skin can morph into iron scales and his bones are coated in iron. If the scales are penetrated by bomb or hard energy jutsu, his bones are incapable of being penetrated by the same things as his scales, plus bombs and D/C Rank Jutsu. (This also means his teeth.)
B: C & D plus E-B jutsu cannot penetrate his scales or bones.
A: Same as B, except E-A Jutsu cannot penetrate his scales or bones.
S: Same as A, except E-S Jutsu cannot penetrate his scales or bones.
Description: Gajeel gained this ability from his father, one of the greatest Iron Release users known to man. Gajeel, being nicknamed the Iron Dragon, can coat his skin and bones into iron. His skin also resembles a dragon scales in this form. This jutsu is one only he and his father know, however, Gajeel killed his own father long ago...
Requirements: Must be Gajeel and must have Iron Release.