Troyes
How does Prior work, and can I add other dice?
It treats one white die as two dice of the same value, and no other white die can be added. Each activation puts a cube on the card (pips divided by 3 in the base card). The cube is spent on a later action, one cube per action, so you can't chain Prior with Monk in one turn. Some players say the doubled die can also fill two Cathedral spaces.