Above is a picture of Tret, the first boss that I have encountered. As you can see my friend Ivan has fallen to our previous enemies.
This boss is named Big Ape(not sure), it is the boss before you leave the endless forest(that's they call it.)It is a bit hard to fight this monster.
The boss is named Hydros Statue, this is the boss in the mines of a town, this is the one causing the flood in their town.
Those bosses above are the only bosses that I have encountered yet sorry...