Main article: Rank

HeroUpgradeChest Hero Upgrade Chests contain Soul Shards used to upgrade the rank of the heroes.

Each Chest may contain one of the following:

Content of Hero Upgrade Chest
40%Gold Knight Soul Shard
30%Warrior Ranger Soul Shard
20%Legendary Mage Soul Shard
10%Explosive Expert Soul Shard

Hero Upgrade Chests can be gained from the Daily Check (the only dependable way, two each month), and from the Poseidon, Battle of Kings and some events, especially Choosing Events and Camp Power Struggle with greater numbers. It also has 1% chance of getting it from Blitz Acres level 70 onwards.