Early game · first 8 minutes
Aim Essence Bomb at Rat King and the troopers beside him. Save stamina to remove attached rats instead of spending it all just to get into range.
Lady Geist vs Rat King
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Mid game · Walkers
Use Soul Exchange when Rat King gets close while your health is low and his is high. Afterward, take cover if Royal Pestments is still protecting him.
Late game · Patron
Hit enemies gathered around the banner with Malice, then throw Essence Bomb at the same group. Stay near cover so you can move out of Rat King’s sight if he starts shooting you.