Mighty Eagle's Dojo | Upgrading your character classes Angry Birds Epic Guide

And here's how the interior of the dojo looks like.

After entering the Mighty Eagle's Dojo, you should be able to see a list of the available upgrades. Each class in the game has access to 3 upgrades :

• Veteran - this upgrade costs 500 Snoutlings. After the upgrade, a given class receives a 20% bonus to health and damage.
• Elite - this upgrade costs 2000 Snoutlings. After the upgrade, a given class receives additional 20% bonus to health and damage (total health and damage is increased by 44% relative to the basic values).
• Master - this upgrade costs 300 Lucky Coins. After the upgrade, a given class receives additional 20% bonus to health and damage (total health and damage is increased by 72,8% relative to the basic values).

As you can see, the upgrades are worth the effort (by finishing the three upgrades, the damage and health of a given class is almost doubled), but they are extremely expensive, so you should really do them with care.

The other problem is that you can only upgrade 3 classes at once - afterwards, you have to wait 3 real-time hours. The clock starts ticking the moment you enter the building, not when you start any upgrade - that's why you should think twice before even entering the dojo. The clock can be restarted by paying 5 Lucky Coins.

Given the amount of classes available in the game (5 for each bird - 6th for Red is only a "remastered" version of the default class), you can upgrade the classes a total of 75 times. It means, that if you want to "max out" the game, a lot of work awaits you (or real-world expenses, to buy in-game currency).