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In Perls of Wisdom, it is mentioned that using the Ophidian currents makes for very potent evocations (or something to that extent).
Is there any primer to this topic which would allow me to start incorporating this particular current into my workings?
Not a primer, no. It's relatively advanced. (IX° O.T.O., at least a very mature 2=9 A.'.A.'., etc/)
Are you looking at Chapter 26? If not, then that has the best pointers I could give you. Chapter 27 may help "between the lines."