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On Desert War, there are no modified heroes; I don't know what you were looking at there, besides the gameplay on this map. Regarding the large number of chests, that's also debatable. At the beginning, you get resources as if you're playing on a difficulty of 100%, but this is often not enough for everything you want, because on the very first day, you buy 7-8 heroes. There is a Pandora's Box with 10k experience (and a guy with Pathfinding nearby), but it's available to both players; it's just a part of this map.