User blog comment:Kevinpeng/Preparation for the Transition to Wrath of the Dragon/@comment-175.136.67.151-20160620042248/@comment-8222987-20160623154400

Actually I think it's pretty similar to the Certificate Treasures. Both use score (however indirectly) to determine which one you get and both have a passive effect of obtaining 1 at around a 50% chance