Early game · first 8 minutes
Place Mini Turrets apart from each other and stand away from them so Scrap Grenade cannot damage everything at once. Use your gun while Rat King turns to shoot a turret.
McGinnis vs Rat King
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Mid game · Walkers
Place Spectral Wall between Rat King and his teammates when he moves toward you. Shoot him with your team while the wall blocks their gunfire.
Late game · Patron
Use Heavy Barrage on enemies gathered around the banner while your team attacks from another side. Keep stamina ready to move away if Scrap Grenade lands beside you.