Originally Posted by Varyon (Post 2392280)

"Save for Half Damage" is typically a feature of the spell/ability rather than the character in That Other Game, so might as well make it the same here - apply "Resistible (Dodge)" to half the damage, and you're good. There's an exception that certain classes do get an ability that lets them change that to "Save Negates," and I think there's an upgrade to it that makes it so a failed save still results in half damage. That last one is fairly easy, actually - IT:DR (Area Effects with "Reflex Saves"), but the "Save Negates" bit is more problematic, given it brushes against GURPS' "No Such Thing as an Absolute" policy. Maybe something like a modified Insubstantiality (with Limitations including "Only against area effects with "reflex saves" and "Requires successful Dodge roll").