Early game · first 8 minutes
Use Ground Strike from high ground to hit Rat King and nearby troopers. Keep a ground or air dash ready to reach cover if Scrap Grenade lands beside you.
Lash vs Rat King
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Mid game · Walkers
Use Ground Strike after Royal Pestments breaks or expires, then follow with Flog while Rat King is still close. Use Grapple to leave if you have a target near cover; otherwise, dash back toward your teammates.
Late game · Patron
Use Death Slam to throw Rat King toward your teammates. Keep him in sight until your whips grab him, and aim where your allies can shoot as soon as he lands.