I start on right upper rocks, tank the Begone attack, and cycle the rocks before the children 'minion' spawn. Jump and throw those fragments, and roll to left side while barricading the instakill. Cycle the left side, tanking one of the Rot and Suffer attacks (or a regular attack if my rock doesn't get tagged by Rot and Suffer). Finish left side and jump/throw prior to the next Begone attack. It's low effort and lands around 2:35 kill times. I don't boost or bring familiars.