Early game · first 8 minutes
Throw Consecrating Grenade toward Rat King when he stands beside his lane partner. If he gets close, aim Gutshot to push him into a wall and stun him.
Venator vs Rat King
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Mid game · Walkers
Place Hex-Lined Snap Trap just inside a doorway Rat King must cross to reach you. Shoot with your teammates after Royal Pestments ends, and keep Gutshot ready if he gets past the trap.
Late game · Patron
Wait for Royal Pestments to break or expire before firing Ira Domini at Rat King. Use the blessed stakes to finish him once his health is low.