Hand of Fate 2

Hand of Fate 2 adds two new types of cards to the deck, Platinum and Brimstone. Brimstone cards look like they are on fire and in order to complete this achievement you must collect the token from 3 of them. If the Brimstone Token begins a chain of cards and tokens you do not need to complete the chain, just get the original token from the Brimstone Card.

The first Brimstone Encounter is very early and involves the Deadly Forest. In order to collect the token for it you must camp beside the forest and then roll a high enough dice roll to succeed. Colbjorn is useful for help on this as is equipment and blessings that add to your dice rolls.

I found two additional Brimstone Cards much later in the game, around Challenge 13 (Reaper) but I must have collected one in between as I unlocked this achievement after competing one of those two.

My current Brimstone Encounter involves a journey to a distant lake and ends with a Wheel Gambit I have not succeeded at yet. This Encounter requires a fair amount of food or really high max life to get though.

I have not found any armour or weapon Brimstone cards yet but will update if I do.