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
However, the ratio of gold spent to experience gained changes drastically depending on the level of the upgrade.

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.
Never compromise your primary win condition just for base XP.It is the most efficient conversion rate.Balance is required. The Guild Economy
This is a massive progression error; donating provides both gold and crucial experience points instantly.

You are essentially converting cards you will never use into base hitpoints and currency.
Progression ActionValueStarter LevelingIncredibly high efficiency; the absolute best way to gain quick XP if you have a slight gold surplusUpgrading High-Level Cards (Lv 12-14)Extremely low efficiency; costs 100,000 gold for a tiny XP bump, but mandatory for competitive viability The Impact of King Levels
You might wonder if grinding out that next account level is truly worth the massive gold investment.

Never neglect your base progression; it is the silent protector that wins games.

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