You'll want public quest armor ("piece of woe") from the ringwar and storm gorge, adorn all yellow slots with 2.5 crit mit from the previous expansion if you have the marks of manaar or whatever.
Then save primal velium shards to upgrade to "rygor" armor, and adorn that with 5 crit mit from velious on all yellow slots. Go for daily double and dominance as much as you can, as these shards are your main upgrade path for armor. The gems drop in kael but can be bought from the marketplace, something like: scintillating X gem
(There are also some armor drops from instances, but they are inferior to the PQ armor due to set bonus, in my opinion, plus it might be easier to upgrade to the really good rygor crafted armor (commission only) then to actually get a full set of instance gear.)