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 :)

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