PS4 I need some advice on the boss fights medium and hard on ragnarok I did the easy boss...

[Dylan Bartlett]

I need some advice on the boss fights medium and hard on ragnarok I did the easy boss but it was still tough (first time fighting the manticore) so what should I bring to medium and hard? How many rexs what type of gear etc. (Singleplayer)

 

[Clayton S Borden]

Asendent rex saddles and 2 mega rex fab sniper n assault riffle n compound bow is wat i use