User blog comment:The Lost Marbles/Seles, the Shooting Star/@comment-25193301-20140802232207/@comment-25193301-20140803175931

As for that bit about the magic damage portion of the on-hit effect, Nami and Xin's on-hit bonus damage is mitigated in all the aforementioned cases, so I figured Seles's should be too. Kassadin's Nether Blade bonus damage still says it's pending for test on his page, though, so I'm not sure. I'll go along with what you say, though, because you seem intelligent.