Early game · first 8 minutes
Charge Kinetic Carbine behind cover, then step out to shoot Rat King. Throw Pulse Grenade where he stops to fire so he has to move or take repeated damage.
Paradox vs Rat King
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Mid game · Walkers
Bring Rat King to your teammates with Paradoxical Swap after Royal Pestments ends. Target him near cover you can reach after trading places.
Late game · Patron
Aim Paradoxical Swap through Time Wall when your teammates are ready to shoot Rat King. Keep a dash to reach cover at his old position after trading places.