Early game · first 8 minutes
Activate Aura of Suffering when Rat King comes close enough for it to damage him and the wave. Turn it off if he backs away, and use Pain Battery once it is charged.
Victor vs Rat King
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Mid game · Walkers
Use Jumpstart before Rat King’s gunfire leaves you low on health; it damages you before it starts healing. If he activates Royal Pestments, move behind cover while the regeneration restores your health.
Late game · Patron
Use Aura of Suffering on the enemies around the banner while your teammates attack. If Shocking Reanimation stuns Rat King when you revive, move toward cover before he can start shooting again.