Look Closely...Veeeerry Closely.

I thought it was dust on my screen at first, but it wasn't.
There is something else out there...
(I found this at the far north border of the desert, near where the Aberrant Cruiser usually roams.)

 

either an aberrant marauder or a TLF valiant.

 

After taking this screenshot, i fought the Aberrant Cruiser and lost, so I'm guessing the Warmonger isn't invincible (I cant think of a time when it was, honestly)

I'm not sure about that. The coloring indicates it is most likely Agrian (Not Aberrant, mind you, they have a more copper-y coloring. Not TLF either, they have black-orange exteriors) There are only 3 Agrian NPCs in the game (This doesn't include Aberrant or ones i haven't found) The Heliorotter, Executor and Enforcer. The object isn't the proper coloring to be an Enforcer, it's too low to the ground to be an Executor (And the Executor has a completely golden exterior, while this has a darker section) And it certainly isn't a Heliorotter. It couldn't have been the Aberrant Cruiser, either, because i fought that just a few seconds after taking the pic. Maybe I'm looking into this too much, but i think whatever is out there is something never seen before.

 

you haven't seen the NEW agrian npc, have you?

 

Oh right, the Agent

It's not that, either. This thing was traveling at a snails pace, while the Agent can zoom around at over 500 Km/h and only slows down to turn or shoot something. Besides that, I've always noticed that the Agent zips back and forth between the north and south of the desert, but I've never seen it fly out this far from the border.

 

Then its probably an executor...

 

It looks to me like the Agent, that thing zips around so fast it sometimes flies far out of bounds for me. The colouring's a bit off but then again it is very few pixels.