xD As it has been said, SD is classified as a Mystic technique. It really doesn't fall under the catagory of a magic skill, despite it using MATK, so GTB isn't much help there. It's why SinXs are often the target for a lot of hate. xD Their SD skips the GTB, their Sonic Blow can essentially one hit kill all but the most vit-oriented classes, they're the best breakers in WoE, and so on. Most servers I've ever seen that have been around for a while, will eventually have a post in the suggestion section of the forum about nerfing the SinX. It has not once failed in a server that hasn't all ready done it in the first place to help hold back the whining before it starts.
Still, they're easy as hell to kill and counter. xD If you have a Prof that isn't an idiot, they're screwed. [ Skill Break the SD, use safety wall to make the attack pointless, freeze / spider web the pure CRIT / DDs early on to get rid of that issue, and so on. ] And that's only the character that comes to me at the top of my head.
