Anti-Incorporeal Shell

Abjuration
Level: Artificer * 4, Cleric */Oracle * 4, Shaman * 4, Warlock * 4
Components: V, S, DF
Casting Time: 1 round
Range: 10 ft.
Area: 10-ft.-radius emanation, centered on you
Duration: 1 minute/level (D)
Saving Throw: None
Spell Resistance: yes

You bring into being a mobile, hemispherical energy field that Incorporeal creatures cannot enter.

This spell can be used only defensively, not aggressively.

Forcing an abjuration barrier against creatures that the spell keeps at bay collapses the barrier.