Or do you need a Ghost Touch weapon?
Yes, you can. However, you need a magic weapon, and all damage inflicted is halved. With a Ghost touch weapon, the damage is not halved, and with a non-magic weapon, you can't hit at all.
You can't critical or sneak attack incorporeal creatures unless using a ghost touch weapon.
From the entry on Incorporeal condition:
An incorporeal creature has no physical body. An incorporeal creature is immune to critical hits and precision-based damage (such as sneak attack damage) unless the attacks are made using a weapon with the ghost touch special weapon quality. In addition, creatures with the incorporeal subtype gain the incorporeal special quality.
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Derp. Well, I missed that.
Hm, does Ghost Touch now make spells like Grave Strike or Augment Crystals like completely moot? I originally changed those to work for incorporeals, but if all it takes is a ghost touch weapon now...hmmm
Hm, does Ghost Touch now make spells like Grave Strike or Augment Crystals like completely moot? I originally changed those to work for incorporeals, but if all it takes is a ghost touch weapon now...hmmm
Pathfinder in general made those pretty much irrelevant, as much less things are immune to sneak attacks now.