We've seen a few powers that make a creature insubstantial now, but we haven't been able to find out what it means. What does it mean and where can we get a clear definition?
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Rules for Insubstantial can be found on page 277 of the 4th Edition Player's Handbook.
The short version is that insubstantial creatures take half damage.
In 2nd edition you became 'insubstantial' because of a spell like ectoplasmic form, which turned you incorporeal or 'not real' in a way. So the effect in 4e (like Ectoplasmic Armor for example), similiar, in that you take half damage. In earlier editions you couldn't be hurt except by +1 or magical weapons, or by spells, when incorporeal.