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.

Conversely, upgrading a card to the absolute maximum level costs massive amounts of gold for a relatively small XP return.
Never compromise your primary win condition just for base XP.The cost is microscopic, but the XP bump is significant.Do not upgrade useless cards to high levels just for XP. 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.
Experience SourceValueStarter LevelingIncredibly high efficiency; the absolute best way to gain quick XP if you have a slight gold surplusMaxing OutExtremely low efficiency; costs 100,000 gold for a tiny XP bump, but mandatory for competitive viability The Margin of Victory
If your king tower was one level higher, it would possess several hundred more hitpoints, turning that loss into a win.

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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