Ultra is very subjective. Almost any system can handle ultra if you dont mind it having a very low frame rate.
30 fps is playable just about everywhere that is not PVP or a Trail.
One more key piece of information, how much memory does the Nvidia GTX 860m have? Is it dedicated memory or shared?
What resolution will you be playing at? The native resolution of your laptops screen is ideal, or will you be using an external monitor?
I dont know how techie you are. If you need help looking up the info let me know.
**EB**