oh yeah another forgotten build...
Ninja C Ring was a good class back in the old days..the damage and spam is really good. It can use Ice Spear(single burst) and Kamaitachi(FAS like MATK).
the thing is... ninjas has something deviant and has to be fixed... it is to make the catalyst unlimited(stones required for its skills.), just like in Kunais/Shurikein(ThrowSkills), Snipers(arrows), Gs(bullets), Prof/Priest(Fking Cloak: doesnt require GEMs for certain skills).
for the dmg boost.. we need someone who is a user of Ninja C(matk) for his/her comment.
maybe @Maiimaii can share her experience on this.