: Whatcha talkin' 'bout, David?
: The two example schools of magic they give in GURPS are
: the Scholomance (Magery) and the Heron Guard (Power
: Investiture). True, it is clerical magic they use, but
: it's still magic.
I think he's just saying that clerical magic, based on Power Investiture, generally has a very well-defined sphere of influence. It doesn't make that much sense for Journeymen to know a dozen different healing-class spells--and then a single "Make suit of armor really tough" spell. A true mage might pick and choose spells from different areas like that, but a Power-Invested pseudomage would probably not.
--SiliconDream