You can come across dangerous opponents in the open world! There are 6 world bosses available in the game right now. For many of them you can find their spawn areas right on the map. Spawn times can vary - for one boss an hour might be enough, while you might have to wait a whole lot longer for another. However, the reward for a victory could be something really special. A rare fury skill, for example.
The raid boss aimed at the strongest guilds is of particular interest. Every week, guilds will fight each other for the right to come up against him. Only the very bravest warriors, who have shown their mastery in battle, will be able to fight against this boss.