it is a server side, but the battle is work even in offline mode (no connection data or wifi, but the battle result need it)
same as summoners war: sky arena, server side but the battle going without the connection to the server so that we can still hack the damage during that battle progress. If it possible to make a mod with high damage for Elements: Epic Hero, please i would like to thank full because the game is very low exp also the mobs in dungeon is too hard for free player