25 pierce
Fully awakened iso set
Ctp of energy
Tip: If your Knull got ctp of energy, do not proc on his 6th skill. Always proc on his 2nd skill. Tap his 6th skill when there's 1 sec remaining on his proc indicator then press his 2nd skill after you see the downward slash. Delay cancel his 5th skill for the buff to activate. You will only need his 5th for the buff and heal. You can cancel it after he pierce himself with his sword. Follow this rotation and have fun:
4dc5dc2 proc on 2
(when his t3 skill is ready, wait for 1 sec proc indicator then 6 delay cancel into 2)