In HQ1 at least it required access to a "higher"/"more complex" part of the Wizardry Otherworld so presumably reliable access to this would need more masteries in appropriate abilities - or else *extremely* effective backing.
I have to say I rather like the idea that it's possible for wizardry types to 'find more efficient connections' in their observations/explorations of their Otherworld so as to allow spell development. I like to think of it as overclocking tried-and-true technology since that is an idiom that allows for horrible catastrophe if (when?) it goes awry! :)
-- John Machin "Nothing is more beautiful than to know the All." - Athanasius Kircher, 'The Great Art of Knowledge'.
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