Didn't realize you intended to give Majestic the Kusar Blades here.
Anyway, I've never seen the Kusar's cut through magical energy-- they should be able to, but in the world of comics magic sometimes tends to operate differently than normal energies. But, yeah: they should be able to cut through any standard shielding/blasts Thor utilizes... Admittedly, that is a hard point to prove, given Majestic's lack of showings against the magical-type. /shrug
Again, though: Thor's biggest enemy here is Majestic's speed. FTL speed+nanosecond perceptions/reactions+the ability to chop Thor in half with a casual swipe.