More materia slots is pretty much always better. . I don't know why they hide it in the remake, there's even a scene between Aerith and Cloud where she shows him her materia, but you can't see it. All materia is mastered with three copies in most cases including Master Magic, Master Command, and Master Summon. Furthermore, each weapon has it's own unique abilities. Even if your build doesn't require the extra Materia slot, fully upgraded +stat materias. For Final Fantasy VII on the PlayStation, Guide and Walkthrough by Nova These are my Materia slots from FFVII. Not sure why you wouldn't be able to swap out other materia or weapons. 5 Reactor Lvl 9 that contains every materia. Lift your. Materia Slots. Cloud's. Your proficiency with these abilities raises the more you use them. Última. Summons go in their own slot to the right of your weapon materia slots. Slot these into your weapon, armor, or accessory to allow you to cast MP-cost magic abilities. Discover the magic of the internet at Imgur, a community powered entertainment destination. Green "magic" materia = elemental spells.