In most arena battlers, your account level (often represented as a King Tower or Base Headquarters) dictates the health and damage of your main defensive structures.

Many players inadvertently stall their base progression by hoarding resources or ignoring the social systems of the game.
Gaining XP Through Upgrades
Every time you spend gold to increase a card's level, you are rewarded with a burst of experience points.

If your sole goal is to level up your king tower quickly, upgrading all of your low-level cards evenly is the most cost-effective method.
Farm masteries in casual modes.Don't ignore spell upgrades.Farm it relentlessly. The Guild Economy
This is a massive progression error; donating provides both gold and crucial experience points instantly.

This is why joining an active clan of fifty people who constantly request cards is absolutely mandatory for free-to-play users.
Donation TypeExperience GainedBasic TroopsConsistent, reliable progressionRare and Epic CardsOnly donate if you do not use the card The Impact of King Levels
You might wonder if grinding out that next account level is truly worth the massive gold investment.

A higher level tower might kill a goblin in two shots instead of three, preventing thousands of points of chip damage over a match.

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