Optimise this build by getting cursed then switching either ring for the dusk crown ring (after getting cursed) then equipping the attached rings. this will drop your health low enough that RTSR works, by adding power within it increases Dmg. further whilst the health drain is being counteracted by Sanctus. the Dragon head/torso also offer the option to use the short period buff increasing Dmg further whilst the resin's offer a little additional Dmg to boost the chance of a 1-hit Kill.