I recently got Duessel to +10, and even more recently gave him atk smoke 4. To test him out, I’ve been trying true solos on the legendary/mythic maps, and he definitely doesn’t disappoint.
Even so, he only kills the axe armour at the end if he has a defence boon. I’ve been wavering between ascending defence and resistance for a while now, so this gave beme the motivation to finally make a decision.