@Anklebite -- That would be a perfectly acceptable homebrew rule, but I'm not convinced that its RAW
[spoiler]transdimensional spell[metamagic]
benefit: a transdimensional spell
has it's full normal effect on incorporeal
creatures, creatures on the ethereal plane or the plane of shadow, and creatures
within an extradimensional space in the spell's area. such creatures include ethereal
creatures, creatures that are blinking or shadow walking, manifested ghosts, and
creatures within the extradimensional space of a rope trick, portable hole, or
familiar pocket(see page 106).
you must be able to perceive a creature to target it with a transdimensional spell,
but you do not need to perceive a creature to catch it in the area of a burst, cone,
emanation, or spread.
a transdimensional spell uses up a spell slot one level higher than the spell's actual
level.[/spoiler]
be convinced.