Commander's Compendium, is purchased from a Commander Trainer for 300 Gold coin + 250 Badges of Honor; unlocks the default commander icons. Catmander's Compendium, is purchased from the well-hidden blue or yellow Catmanders for 300 Gold coin + 250 Badges of Honor; unlocks cat-themed commander icons.The Catmander's Compendium will cost 150 Gold coin + 250 Badge of Honor, if the player has already purchased a Commander's Compendium. Basically the only difference is the icon, the price and the process of acquisition. Hope this helps. So the only thing that's different is the icon and the price if you already have one?What about Warbringer? Does it matter which compendium i get? Or do i have to get the Commander's compendium specifically?It does not matter which one you get, both give you the same options as commander. As for the Warbringer that is just for aesthetics, if you want to look extra cool while being a commander. So ultimately the choice on compendium is up to you to decide on which icon you like better.