Having gotten a handful of these as my characters have progressed, it appears these are one use only mission quests when you learn them? Kinda a bummer if thats the case but on the same note, I am glad I havent splurged on buying the overpriced ones on the market.
If they are one time quests, is there anything special other than the reward bonanza you get from doing them? Like a chance at super sekrit plans or something?