Any mod suggestions for a returning player

[JonBrave]

Well, thank you, I nad assumed spells were "hard-coded" and couldn't be added.

I had a brief peruse of the modding pdf. 2 pages for spell modding. The range of things tnat can be done from there doesn't seem to cover what can be done by the in-builts, e.g. there's just tables of how much cost & how much damage. Surely most/many in-builts are not "doable" from modding? [Edit: Or, perhaps, existing ones are doable, but you cannot introduce a brand new "effect"?]

P.S.
Happy New Year to all in this great community!