I know many people are struggling with this fight and thanks to a video by Unofficial Kabam Mike, he made a cheese video soloing abs man with Doom and I wanted to spread it out more. You can check out the video yourself or you can read what you have to do in this fight.
Recommendations: I recommend boosts for your doom being power boosts, special boosts, attack rating, boosts, and health boosts. It just depends on the rank of your doom
I also highly recommend Mystic dispersion for when you neutralize the unstoppable buffs you can get power faster.
I really recommend a relic because of the cycle that is used. You can use the relic for heavies during the cycle
I did the fight with a r3 doom boosted. But r4 and r5 would be perfect if you have him at that level
The fight:
DO NOT FULL COMBO HIM. You want to parry and heavy and keep doing that. This is where MD is important for more power. Keep using your heavies until his form is gone then you can start the combos. Build to sp3 and make sure he is at a sp2. We all know the doom cycle so it’s a little bit like that but you’re just doing sp1 and sp3. You can heavy him if you want, but it might be a little risky so i would wait until you have your relic ready then heavy. But do it fast before you lose the aura. Repeat until dead and once he’s almost dead you can use a sp2 if you’d like. And there you go. Abs man soloed

This is my result. Share yours please!