tech mod packs got some extra love but magic didnt and i recently found these two modpacks and thought their themes were really cool, particularly occultism that was a bit thaumcraft-ish. generally theyre just quite cool, although their weapons/armor/etc might need some scaling up/recipe changes for this pack.
malum: https://www.curseforge.com/minecraft/mc-mods/malum
occultism: https://www.curseforge.com/minecraft/mc-mods/occultism
there may be addons for these also, but i couldn't say how useful/necessary they are