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Magic Resist Reduction Debuff Mechanic Question

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I understand that for magic resist it's

(Magic Penetration Percentage * Magic Armor) - Magic Penetration Flat

Parentheses for clarification of PEMDAS...

However my question is what is the effect of something like Abyssal Scepter or Amumu's passive in regard to these mechanics? Does it then become:

(Magic Penetration Percentage * (Magic Armor - Amumu - Scepter)) - Magic Penetration Flat

or is it just added to the flat from the previous equation?
Thank you in advance.

Also, a search yielded no relevant results, so my apologies if this has been posted before.

EDIT: Figured it out. All debuffs (percentage and flat) are applied before your penetration.

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Mister Sausage

Junior Member


its been like that since beta