i don’t know why they decided to make them spawn like this where they don’t spawn every time u load up a save point its hard enough to get the legendary u want especially the anointed roll u desire also can’t stand the ones u have to grind through proving grounds or slaughter. it jst makes people who don’t got the time grind not want to play the game at all. jst noticed Indo tyrant the t-rex doesn’t spawn every time either.
You’re honestly better off farming Graveward/Gigamind/Slaughter Shaft. Even if you don’t get the thing you’re looking for, you might find something that would make a good trade for the thing you’re looking for.