"War of Wizards" is the first clear statement by Phil on how he thought magic would work in his world. It is very 'Vancian', which makes sense as Phil was a good friend of Jack Vance - Phil did the first map of the Dying Earth for him, back in the late 1940s/ early 1950s. It is very rich and nuanced, with lots of spells with names redolent of Tekumel. EPT's spell lists, on the other hand, are very short, laconic, and almost perfunctory; they were done in the 'Arnesonian-Gygaxian' style, as Gary wanted EPT to be as compatible as possible to D&D. Phil went back to his original conception with S&G /"Gardasiyal", with recondite spell lists and effects dependent on the skill and ability of the sorcerer. "Bethorm" builds on this, and is the direct descendent of S&G in this as it recaptitulates what Phil did in S&G.
"Ebon Bindings" falls outside this line of development, as it is the equivalent of the unpublished M-series spells that lie beyond the top of the published spell lists in S&G. It's the higher level stuff, not normally seen in the setting or in Phil's game play.
The line of thought in "War of Wizards", S&G/"Gardasiyal", "Bethorm" would be my preference; I use it myself in my games.
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