Summoners War: Sky Arena is an online mobile game, Role Playing Game RPG, in which you will explore a world under battle over the vital resource: Mana Crystals, is free to play on Android devices, from Com2uS.
Download the game at:
https://play.google.com/store/apps/details?id=com.com2us.smon.normal.freefull.google.kr.android.common&hl=en