Are there stronger bosses in game ?

Hi there
I just found out about the game and I'm looking forward to downloading it.It looked awesome so I watched a few videos out of curiosity and I saw this Massive boss called Attauis I think.
I just wanted to know if there are more bosses like this one or stronger in the game.I have been looking for a good MMO for a while and I think this is the perfect one.
I'd like to hear any comments or opinions about the game too :D