The Training Academy

Quick Notes
The Academy is the place where you train your dragons to the next level every third level, Toothless being the only exception.

Wood is used to train your dragon here, the amount varies for dragon species, dragon level, and if the dragon is named.Upgrades to the Academy are done with wood. New levels for the building are unlocked based on the population of Berk. The more Vikings, the higher level Academy you can have.

The Acadeny also sets the level cap on Dragons. It's appearance changes with each level, becoming bigger and more elabrate with each new level.

Training Slots
A new addition to the Training Academy is that you are able to add extra training slots to the structure making it so you can train more dragons at one time. The following chart you can find the prices, do note that these expansions cost you Runes, the only free slot is the first one that is basic.