Ok for a Myth point of view. But for a game point of view, 1 rune point for 2m diameter, it is crap. As it reduce the visibility to 1 m.Therefore, you are visible. Or you need to spend 2-3 rune points (or even more) to make it useful. Shield 3 is far more useful then.
I understand that spell should be backed up by myth, but the area of effect (or the power) is more related to game (and fun). This spell is not fun. Neither is he useful.