The target coalesces into a semi-physical form for a short period of time. While subject to the spell, the incorporeal creature takes half damage (50%) from nonmagical attack forms, and full damage from magic weapons, spells, spell-like effects, and supernatural effects.
Corporeal spells and effects that do not cause damage only have a 50% chance of affecting an incorporeal creature.
As I understand is a spell cast by a corporeal caster a corporeal spell (with exceptions like force spells). Does that mean the Ghostbane Dirge spell only has a 50% Chance to affect the incorporeal target?
Seams odd to me.