I have killed the warrior, saved and quit, but how do I get that fast travel spot so i can farm him?

As far as I know you have to walk there from the hero pass FT point.

But once you're there you can leave game and continue to have him respawn.

If you go somewhere else you just have to walk there again.

Ok

Well that is what I did, and I see the fast travel machine with the sign above saying only one way. BUT in youtube videos I have watched they have that tp open as a choice to go to. I want to figure out how. I will post the links to the vids I saw this in.

some mods probably allow 2 way travel to one way points I would assume

Just save/exit once u loot warrior then remake

When you in his chamber, kill him, then save and quit, once you reload youll be at the ammo dispenser
rinse and repeat

^^^^^