Magic textures will be read from "New_Translation" folder, and inside it, there is a "textures" folder, that's where you put "battle" and "magic" folders which are the textures you need. All of the rain, seffect, etc pngs have to be in battle folder, and a lot of subfolders (like limit, summon, spell) with a lot of pngs have to be inside "magic" folder in order to work.
(eg. rain7_00, seffect1_00)
/->battle (folder with 82 pngs)
so... it should be like this: The_Reunion -> BASE -> New_Translation -> texture ->
/->magic (folder with 8 subfolders and 1299 pngs)
(e.g: blue, limit, summon) (e.g: a1_00, a2_00)
Hope it helped. Do note, that magic textures provide some microstutters during casts, at least that's what it did for me, so you'll have 1-2 seconds freeze whenever you cast a heavy spell, especially summons.