Buy armor to make the raid easier on yourself. For starters buy both chest armor and leg armor. Make sure that the armor you buy has specific perks that allows you to carry more ammo for specific weapons For example my chest armor allows me to carry more sniper ammo and my boots let's me carry more machine gun ammo and they both have intellect and discipline. Trust me ammo makes a big difference during the boss encounters expecially when you are dpsing. If you already have armor that satisfy your needs buy a helmet that replenishes your health when you pick up an orb. And For gauntlets buy one that increases the reload speed for your sniper or your specific primary weapon but I would hold off on that because the raid gauntlets are superior than the normal ones. The best thing about the armor is you can infuse it so it's not a bad investment