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if you are talking about the p7 bomb: the damage for big bomb = the red bar. So the best damage mitigation is killing the runes fast. I also use vit pot + disruption shield after the melee slam. if you don't yet have disruption shield you can just do vit pot + reflect

there is an updated kill which is almost 1 minute faster that I recently posted. I just improvise the rotations but you can see what I am doing in the VOD - Have 5 souls and high necrosis, and getting bloat + command skeleton before pad finishes charging. - Skull > volley > finger > t90 spec when pad finishes charge - t95 spec for grey hp/witch - Alternating between splitsoul/living death/omni spec for pads - try to bloat zammy right before you go into infernus to kill witch P7 cutscene Invoke death + demon slayer Demon: Omni spec > soul sap > summon conjures > touch of death > auto Target zammy: invoke death + vuln > soul sap Rune 1: Soul sap > basics LD + Apot Rune 2: Soul sap > touch > auto Surge to zammy Devo + melee pray > Soul sap(if you need 1 more soul for 5) > finger > finger > Vit + disrupt shield + volley > shatter/t90 spec

It's possible but not something I want to do. If you can get to 500% zamorak you would presumably make enough gold to get t95 setup