Board Thread:Game Discussions/@comment-26513944-20150814075002/@comment-26329238-20150814085725

it means that the basic mathematic chance of getting a Dragonforged is multiplied by 5, idk what exactly the basic chance is, but it is still pretty low.

in addition to that, if you open multiple chest, the chance doesn't cumulate for the 52 chest but get's calculated for every single one of the chests individually.