Campaign is the main PvE component of the game. It follows the main storyline, allows you to meet new heroes on the way and offers variety of rewards, that are both beneficial and necessary for your in-game progress.
The primary way to obtain Expansions for your capital city and Research Materials to progress through the Research Tree is to play Campaign battles.
Campaign
Campaign comes with the main storyline of the game and offers a range rewards, such as Experiences

to level-up your Heroes, Research Materials

required to unlock specific technologies in the Research Tree, Antimatters

to power the Time Portal and expansions

to expand your Capital City.
Each region of the World Map is associated with a unique era and a distinct set of heroes that you can encounter and unlock for your army. Visit the
Provinces tab for a detailed overview of the rewards available in each province. This can assist you in planning which encounters are worth prioritizing during your battles and which ones offer the best chances of obtaining the items you need. Replaying battles is crucial for obtaining Experiences and Research Materials.
Stamina
Stamina is essential for initiating battles on the Campaign Map, with each encounter costing 8

(regardless of the outcome). It regenerates at a rate of 1 per 2 minutes. You can earn more Stamina from Quests, Treasure Hunt encounters, by watching ads (one ad gives 8

and you have 3 available ads per day), from rewards of Allied City events or by purchasing it with gems (100

for 50

).
Stamina is also required to initiate battles in Tesla Storms. It's important to manage your Stamina carefully and spread it between both features - Campaign gives you experiences to level-up your heroes, while Tesla Storms allow you to ascend them into new heights.
Automatic Battles
Victory Tickets can be used to instantly receive a reward for the campaign encounter that has been completed with 3 stars. It can be received from Quests, by watching ads (up to 6

per day) and most importantly, from completing daily quests in Season Pass (up to 23

daily).