Lmao! The FFVII Card!! Ah SE! How have you fallen!!!

Eitherway, that materia system sounds a lot like the armor slots/get system we got in wow.

I like it, this game is more wowish each month :O
Except lolWoW referencing & SE could put a spin on it.

Materia system could be equip-able slots (armor having armor basically). "Materia" could be taken up as Key-items and you scroll through to find the one to equip. It's not "fused" and used up after you attach it. (/wish)

Either way i just hope it's not some half-assed slot/enchant system that you just tack onto equipment (even though it would still be good to have).
Odds are SE will be using it's beta testing (see: FF11) to do adapt Evolith or Synergy-like systems into how this will work.

Please SE do NOT make this random, yet have worthwhile stats.