As you get Cayde-6’s caches from the four destinations you might notice getting a Lore triumph. I know some players have only gotten three of those four and then gotten one from the mission Ace in the Hole. There has been much confusion of how you could get the remaining nine. Today I just played said mission as a daily heroic and got another triumph for Cayde’s corresponding lore tab. Therefore I have concluded that every time you do the mission Ace in the Hole you have a random chance of obtaining a lore card from one of the ten chests every time until you have all 13. Hopefully this helps any of you fellow collectors out there. EDIT: I also just found one from a chest in the Tangled Shore, so they also have a small probability to drop in destination chests too. P.S. If you were to include this in a lore video or some kind of tutorial and you have read this article, please make sure to cite me.