Lvl 5 side quest

Am trying to get the 7* shards in threat lvl 5. The abomination is being annoying as hell to fight with his regen. Who could I use? Ideally someone poison immune and to stop the regen bc I have 6* r3 champs lol, so not a whole lot of dmg. Any suggestions?
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You could dance around and let void do void things.
Again probably slow because you have low rarity champ but if you make scorpions prefight one of the other two you can use his sp2 for petrify.
You have a 6* warlock. Get him to 20 techno viruses and you will heal reverse him. Plus since he is a robot he will be immune to poison.
Black widow Claire voyant. You can put her in the poison and then keep spamming sp2 to make him buff immune so he can’t get the regen buff