I try to maintain logic to a point that ones suspension of disbelief remains suspended as I push the limits. I try to bring all of my higher dimension attacks down to a real world, relateable source. In this case, its that the ethereal charge would destroy whatever metaphysical (which encompasses both psychic and spiritual planes) bonds allowed the weapon to manifet and do what it does, in the exact same way plasma or fire destroys things.

I like to term it metachemistry.