Untamed is an expansion with 2 dual faction heroes that worship both Nupten and Liothan at once, helping you mix blue and yellow heroes together. In gameplay terms, when these heroes take a worship action you resolve both the blue and yellow worship in any order of your choice. This is the fourth and last release of the dual faction cycle including Stormsear, Winterdeep, and Unforgotten. Untamed features the new type of power cards with two different kind of runes at once that can only be played by heroes with both runes. There are 5 blue/yellow and 5 red/yellow power cards. —description from the publisher