Getting new items at the mist.
That’s because from rank 10-19 you get deer(?) tokens which make those krait weapons and armor sets. If you want new armor you’d have to get rank 20 which will reward you dolyak tokens or do tournaments for tournament tokens.
Check this for more info:
http://www.guildwars2guru.com/topic/55030-pvp-mystic-forge-recipes/
Ah will have to play a bit more then!
Thank you!