why not some open world world bosses ?

[Thorbaldin]

Imagine in the most desert part of the open world some world bosses with their own méchanics just roaming

you could spice it up with some quest to get them

[Starkobjekt]

Nerubian Overseer, Turthlu and Dark reaver + the wbosses from vanilla is quite a lot already but if you have a good idea for a new one you should suggest that but just asking for more without an actual idea for what is not gonna help them with content. I'm sure they are up for suggestions but you're not really suggesting anything here for them to work with.