Random Chaos across Tyria
While this would indeed make it feel epic, this would kind of kill the next 70 levels of the game, since that’s basically giving them a taste of what the endgame dragon fights will look like. And knowing the ending before reaching it kills the drive the attain it.
It doesn’t have to be a dragon, I just used that an an example. It could be an army of Icebrood led by a Champion. Perhaps one of those huge Icebrood Norn, or an Army of destroyers led by a large lava monster.
Perhaps all the pollution the charr have created with their machines has led to the creation of some kind of foul concoction that has gained a type of awareness and is looking to spread corruption all over.
The possibilities are endless.