Instead of saying "Advanced versions of the spell unlock at skill 20", how about, "Advanced versions of the spell are available as Hard Techniques with a -5 default to skill"?
This lets the guy with Fireball-15 have Explosive Fireball-10, and able to buy it up as desired; it just won't exceed Fireball.
Speaking of Techniques, I noticed you said:
Quote:
The individual Seek spells are at best Easy techniques to Finder with a default of 0.
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Technically, there are no "Easy" techniques, only Average (1 point for the first level) and Hard (2 points for that first level). How high up from Finder are you expecting the Seek techniques to get? A max of Finder+5?
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"Life ... is an Oreo cookie." - J'onn J'onzz, 1991
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The GURPS Marvel Universe Reboot Project
A-G,
H-R, and
S-Z, and its
not-a-wiki-really web adaptation.
Ranoc, a Muskets-and-Magery Renaissance Fantasy Setting