Optional: Gravetender
Maximum souls: 448,290
The Gravetender and Greatwolf are weak against poison and toxic. Use the strategy shown in the video below to cheese the 1st phase of the fight. In the 1st phase, cast Poison Mist and Toxic Mist on the 3 wolves and the Gravetender. Once they are inflicted with poison and toxic, use the Arbalest to snipe the gank with Exploding and/or Splintering Bolts. During the 2nd phase, you have the choice of entering the fog wall to fight the Greatwolf or use the 2nd phase cheese shown in video.
Dark Souls 3 SL1 Boss Cheese : Champion's Gravetender & Greatwolf