Bug, Dormamu isn't taking any damages

In northern expedition Canadian quest chapter 2, Dormamu wasn't taking any damages against HT even when 7-8 debuffs were applied on him.

Comments

Did you use torch pre fight ability? If yes then that's why, nova flames aren't debuffs.

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Nova flames aren’t debuffs. If you use human torch, don’t activate his pre fight ability.

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I remember that dormammu was not immune to cremation. Or am I wrong?

Dormamu my be “on fire,” but he is not immune to incinerate.

You need to apply 3x debuffs in order to do damage.
You have none. Try apply incinerate debuffs, and not passive nova flames