[Taqwus]

Ironhawk said:
How do you curse someone else's luck? Is it a spell?

You don't. Kurgi, Umor, et al do.

Try casting 'Wish' for a 'Slave to Unreason'. Or... maybe not.

Is there also a spell to banish ethereality?

Nope. However, magical weapons and most spells already ignore it, and there are spells to enchant normal troops' weapons (ex. Flaming Arrows, Weapons of Sharpness both count if memory serves).

Now... true ethereal is harder to deal with.