User blog comment:IamJakuhoRaikoben/Chapter 473: Red Lightning, Review./@comment-112.209.237.205-20160215185652/@comment-5303512-20160216005446

Not literal barrier but the particles can feed on Ethernanos, mages gather Ethernanos to fill up their Mage tank to use more magic spells. MBP as of right now can cause negative effects to Laxus, it looks more like mucus which can act like blockage for temperature regulation and breathing, you can caugh it up but it is irritating and painful, since it be removed then it just sticks on the organs rather than just fuse with them.

Wahl's Nullifier doesn't look like it is a spell or anything.