Focus vs. Source

An explanatory box on page 7 of GURPS Powers on how they can be different or same (for example harnessing spirits to influence other spirits)
2006 Nikolai points out http://forums.sjgames.com/showpost.php?p=335033&postcount=2 that Magery (131) Power Investiture (126) and Cosmic Talent (125)
:Focus is more or less an entire Power Source if the GM permits it ("at the GM's option", see pp. 126 and 131).
Category:Rules