- Super Nova
- Black Materia
- Weapon Summon materia
1. Super Nova
The best special-fx materia of them all. It's been rumored the Super Nova materia is available in the game. Two methods I know of exist in obtaining Super Nova:
A. With a silver chocobo, go underwater and visit the crater. Inside you will fight a monster called Alpha-Leviathan. Defeat it, and you'll win the Super Nova materia.
B. With a golden chocobo, explore the northwestern area of the world map. There will be a very tiny island in the middle of the ocean that will only become visible at extremely short-range. Land on the island, and walk around. You will then eventually fight a dragon called Milkur. Defeat Milkur, and the Super Nova materia is yours.
This rumor is pretty interesting. On disk 3, explore the underground area of the Ancient City (which is usually blocked by Mr. Fish), and you will find a secret set of steps leading down. Equipped with the Underwater materia, go down to retrieve the Holy (aka White) materia. Cast it to revive Aeris (wish it was as easy as that...).
3. Black Materia
Why would you want to use the Black Materia and cast Meteor again? Anyway, it's been alleged you can use the Black Materia and slot it in a weapon. It'll boost all your stats to maximum, except Luck (which will plummet to 0). While in combat, you can cast the Meteor spell, which is said to be much stronger than Knights of the Round.
4. Weapon Summon materia
Latiz believes a Weapon Summon materia exists in the game. To get the Weapon Summon materia you need a mastered Morph materia and a Luck Plus materia. Fight any of the Weapons (excluding Diamond Weapon) using only Morph on them when they have less than half of their HP. Beat them with Morph and you should get an emerald gem, a ruby gem, or a zircon gem. These are key items for getting a Weapon Summon materia at Cosmo Canyon. This materia is capable of casting Weapon summons. Their damage is more than triple of Knights of the Round and give several effects to the enemies, but you'll also receive damage. You will need a Final Attack materia linked with Phoenix to survive the summon. You can also use them to add the effects of the spells to your weapons or armor. If the Turquoise and Onyx Weapon are avaliable in your game, you should be able to get a gem from them. The cheat only works with the huge materia at Cosmo Canyon.