Substantial Only

Substantial Only (B63 -10%) is introduced as a limitation for Invisibility.
Not Insubstantial is another way to think of it. This helps to clarify that unlike the Insubstantial Only meta-modifier it does NOT impart the ability to affect substantial foes if that is not present.
*for example, for an Insubstantial foe to attack substantial foes, they would first need the Affects Substantial enhancement on their attack, that +40% cost would be reduced to a net +30% cost by applying SO to it
==Broader usage==
GURPS Fantasy page 33 also applies it to the Mute disadvantage.
GURPS Supers 34 also lists
GURPS Power-Ups 8 p 18 finally defines it broadly for "attack or other ability"
*the intent here is largely to 
This works differently than "Insubstantial Only" (which does NOT require "Affects Insubstantial" as a prerequisite, per Astral Sword) because this DOES require "Affects Substantial" as a prerequisite on abilities which only affect insubstantial things by default.
==see also==
*Affects Substantial
*Insubstantial Only
Category:Limitations