Campaign
The Campaign button takes you to the Campaign map. This is where you will find all the chapters of the game in the form of map sections. These sections are level locked. Meaning they all have a minimum level for you to tackle them. Each map also has a specific Hero Token. Collect the required number of these to unlock the hero of that token. The campaign maps are littered with various enemies with their own Elements and special abilities. You must deploy a team that can effectively progress through the stages and beat the game.
Heroes
This is where you can view all your collected heroes and upgrade them by using their respective tokens to increase their stars which give them a huge boost in their overall Stats, ascend them to give them a fair boost in stats and new abilities be it passive, active or even both, or level them up using exp potions (do remember that they cannot go past your player level).
Portal
The portal is where you can attempt to obtain heroes of varying caliber. There are four summoning types you can use to get heroes each with increasing effectiveness. The first summon type is the Great Summon. The Great Summon uses 10,000 gold coins to open one chest, or 100,000 gold to open 10 in a row with a sure chance of five gold chests appearing. Opening silver chests here will usually grant potions, some lesser evos and maybe some hero tokens. Gold chests hold a greater amount of hero tokens and always has a hero token. The next type is the Heroic Summon. The Heroic Summon uses gems to summon a hero. You can spend 300 gems for one summon or 2,700 gems for 10 summon attempts all having a sure hero or hero token.