Early game · first 8 minutes
Use Scrap Grenade to clear summons around the wave. Shoot Graves when she steps forward instead of spending all your ammo on summons.
Rat King vs Graves
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Mid game · Walkers
Avoid crossing Grasping Hands to reach her. Advance with teammates and Royal Pestments, then send rats when Graves is within reach.
Late game · Patron
Use Scrap Grenade to clear summons around the objective. If your team can cover you, destroy Borrowed Decree’s gravestone with two heavy melees.