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Originally Posted by basketofseals
You must not have played for a long time, because certain spells(they're not necessarily ultimates) are hard coded to pierce magic immunity. This is most noticeable for certain skills such as Enigma's Black Hole and Kunkka's Ghost Ship which are only partially affected by magic immunity.
This. Not sure how so many of you are getting this confused. There are skills intended to go through BKB partially.