No no, you see. Incorporeal is a form of non-corporeality and intangibility. Think, a shadow.
But when this type of creature also reside in the Ethereal, it normally can't even be reached (it's simultaneously spatial intangibility and spectral).
It's double intangibility.
Abjuration and force magic doesn't care. The Deva has access to Dispel Evil, an abjuration magic that can target the double intangibility (and even more, straight banish evil back to their plane of origin).
None of that explains how he can hit Griffith though.
And I don't mean multiple types of intangibility, I mean literally Intangibility+1. Not to mention, does Deva even have the range to interact with Griffith? Tens of meters ain't cutting it, you need at least an interdimensional range (Probably 3).
Guts has a cool sword that can wound Slan, who's real body exists on the Astral Plane, and he can do so by interacting with a body that isn't that body. Despite that, The Dragon Slayer is incapable of interacting with Griffith.
What you're describing Deva can do just sounds like what the DS can do, which as mentioned, is powerless against Griffith.
I think you're conflating "double intangibility" (as in, multiple forms of intangibility at once) with
layered intangibility,
These things can also be targeted normally by magic, ignoring even the incorporeal and ethereal statuses, btw. The Deva itself has that property, it exists simultaneously in up to 3 planes.
3 planes, but how deep? Femto can **** around 3 layers deep (layers not in hax potency, but rather the astral world has stages to it, think almost like circles of hell type shit). It's not just interdimensional per say, but layers into it.
But again, I think youre confusing having multiple types of intangibility with layered intangibility. What you're describing seems similar to the Other God Hand and how they work, but in Femto's case, he's clearly just built diff and stuff that works on them doesn't on him.
I could be misunderstanding you but eh.
