Endless Trial


 * 1) The Endless Trial lasts for 48 hours and opens every next 48 hours.
 * 2) You must pick at least 1 hero to join the Trial, but you can pick 5 heroes at most.
 * 3) In every level, you will meet with random enemy, tap the enemy to check the attribute, then choose one of your hero to pick up the fight.
 * 4) You can skip the fight or observe normally.
 * 5) Every battle will have a limit of 15 rounds, take down the enemy within 15 rounds and you will win, or you will lose.
 * 6) You may get four kinds of reward after each battle: chest/Merchant/supplies/buffs
 * 7) You will get random reward from the chest
 * 8) The Endless Trial makes from three ranks: Easy, Normal, Hard. Each rank contains 100 levels.
 * 9) There will bea check point in every 50 levels. Everytime the Trial opens, you will start from last check point and obtain reward from all the levels you have passed.