I've always wrote badly poisoned and I guess I'm misunderstanding where the problem is in the present tense:
Past: Misdreavus was badly poisoned / Misdreavus took damage due to being badly poisoned
Present: Misdreavus is badly poisoned / Misdreavus is taking damage due to being badly poisoned
Unless I'm just missing something which is totally possible
Don't count the days, make the days count.
Katakiri: How did you even get into this university?