Re: Parry
No you do not buy group skills like that. The group only exists as way to spell out what the skills have in common so they don't have repeat the text over and over for each skill. You still need to by each individual skill. Though GURPS has a cinematic option called Wild Card Skills where you buy one expensive skill and it lets you use that one skill for everything in the theme of the wild card skill.
Psionics is an example of subsystem that got fully explain latter in GURPS Powers. Psionics is just away to group a theme of otherwise normal advantages, gives them a "power modifier" that makes them cheaper because the fit the theme and because it opens them to counter mentions like Neutralize and Static [similar to the ways spells can be dispelled and countered] but also open them you buy a "Power Talent" that has the same focus as the them (Telepathy, ESP etc) the gives you a bonus when you try to use the Psionic modified advantages
For example you can buy Mind Reading without modifier and it behaves exactly like the advantages says it does or you can buy [I[Mind Reading (Telepathy, -10%)[/I] making it cheaper and getting to ad you Telepathy Talent to any rolls you make to establish contact with it, but at the cost that there will be people out there the block your ability to do so.
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