At least this is what a guildmate told me yesterday when I complained about no sunders being on him ;). They explained that C'thuns armor starts as a negative value and sundering actually increases it (towards plus).

Would be nice if I could get a confirmation whether it's true or false :)

I think you could use some guild coordination

hehe two threads about this in one minute, both from the same guild, seems like there was quite abit of discussion going on about it yesterday in your guild