So you'll basically earn one of these a week, per character, in the background if you pick up the quest from Felwinter's Peak every Tuesday. This was great to unlock all 8 in the first three weeks, but now I find that I've got more than I'll need. Turns out the max you can hold in the Vault is 8. The max you can hold per character is 8. So, while only three Artifacts are available every week (with usually crappy rolls), you can hold enough Legacy medallions to buy more than ten of each. The idiocy of all the special currencies aside, like with every other special currency (Keys, Etheric Light, Tokens....) why don't we have an option to turn surplus Iron Lords' Legacy medallions in for rep somewhere? I'd like to do something with a few of my twelve...