This is a permanent challenge that opens up for new or returning players and stays open for two weeks after which it will disappear from your account. The event consists of 8 challenge stages that will enable you to earn useful rewards that will help you progress quicker in Battle Breakers. These first-time rewards are as follows.

Round 1: 5k XP
Round 2: 100K Gold
Round 3: 5 Minor Strength Elixer and 5 Minor Health Elixer
Round 4: Bronze Hero Crystal
Round 5: 2 Shimmering Nature, Fire, and Water Essence
Round 6: 3 Major Strengh and 3 Major Health Elixer
Round 7: Silver Hero Crystal
Round 8: Silver Hero Crystal and 300 Gems

Listed above are the guaranteed rewards, each round will also drop loot that includes gold and EX points.