Hey, I'm playing through the mod again, and I just got the Mega-All materia, and fought the Kaktuar (I think that's what it's called, the silver Cactuar with the retro 3D glasses).
I'm just wondering, the various key items you get for doing side quests and such - the 7777 Needles, the Pulse Ammo, the Dark Matter, the X-ATM Core, the Oversoul Shards, and so on - do they actually do anything Or do they just sit in your inventory to look pretty?