Pro tips, Avoid ennemies at start, Get every time bonuses, Get all items that can help you. Never get cornered, always let an open space behind you without ennemies spawning behing you to move fast. Always get a plan for the hard bosses on that mercenary game mode. Don't use waste ammo. Get out of sight of crossbows. Quickly get the boss out and move more when things gets hard. That's it pal, now you have everything to do better and blow up thoses 5 stars !😊