Early game · first 8 minutes
Shoot Rat King from cover and use Rake once his health is low. Keep a dash ready to remove a rat and get back to your lane partner.
Mina vs Rat King
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Mid game · Walkers
Use Sanguine Retreat to leave when Rat King activates Royal Pestments. Move toward cover before you reappear so he cannot keep shooting while you wait for the barrier to end.
Late game · Patron
Use Nox Nostra as your team attacks Rat King. If the bats silence him before he activates Royal Pestments, follow with gunfire and Rake while he cannot use it.