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 equal to the difference between the hero's next level and current level. In other words, the hero's current amount of experience does not affect the amount of experience recieved from the tree. Naturally, the tree will give more experience to heroes with higher levels beacause the gaps between experience levels increases exponentially. The tree will give the level for free, for 2000 or for 10 .
There can be up to 32 Trees of Knowledge on the map.