League-of-legends – Will on hit magic damage proc maw of malmortius’s passive lifeline

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In the Offense skill tree there is a mastery that gives you +magic damage on hit from 5% of your total AP.

If a champion you are attacking has maw of malmortius or hex drinker will the lifeline passive get proced from the attack?

There are also items that give +magic damage on hit like Lich Bane or Nasthor's Tooth. Do the items also proc the passive, lifeline?

And finally if only one of these proc lifeline will the shield block the magic damage of the other while the shield is up?

Best Answer

Maw of Malmortius says:

Unique – Lifeline: Upon taking magic damage that would reduce health below 30%, grants a shield that absorbs 400 magic damage for 5 seconds (90 second cooldown).

This seems quite clear, upon taking magic damage (from any source including things like masteries, Darius's passive, Lich Bane, etc) it creates a shield that blocks magic damage (from any source) so long as that damage is taken during the 5 second shield duration.