Tree of Knowledge
Tree of Knowledge is an adventure map object which gives an experience level once per hero when visited. The amount of experience the tree gives is the difference between the hero's next level and current level. The hero's current amount of experience has no effect to how much the hero gains from visiting the tree. However, the tree will give more experience to a hero with higher level beacause the gaps between experience levels increases exponentially. The tree will give the level for free, for 2000 
or 10 
.
There can be up to 32 trees of knowledge on the map.