[PU4, Powers] What does Cosmic power modifier actually do?

[Gurps Fan]

Originally Posted by Bruno

If you don't have any other Cosmic modifiers, just the power modifier, you still have a +50% cosmic on all your stuff.

On your defensive abilities, I'd say that makes them the standard +50% defensive cosmic - ie your defenses can't be bypassed by cosmic attacks. On all abilities, defense or non-defense, I'd say your abilities are ironclad against non-Cosmic attacks - your abilities can't be crippled, neutralized, static'd or whatever without the attacker having Cosmic. I'd

Sorry if I'm unclear. To make the point clearer, let's take an example: Enhanced Movement (Second Nature, +150%) (see PU4, p. 9). Actually, "Second Nature, +150%" is just a shorthand for the combination of certain three instances of +50%-level Cosmic. Should this Enhanced Movement (Second Nature, +150%) advantage be an ability as part of Cosmic power? If not, how many percent should it cost to adding Cosmic as power modifier?