From Disc 2 onwards, you have the chance to find and collect four 'Huge Materia'. They can be gotten from these locations: Blue Materia - North Corel. You have to save the town from being destroyed by a train during Disc 2. Yellow Materia - The other Huge Materia is located in the Condor Fort-- you can only get this during Disc 2. What you have to do is win the 'mini-battle' sequence atop the tower or you won't receive the Huge Materia. Green Materia - Rocket Town. After you and Cid blast off in his ship, you'll have to enter the code command to free the huge Green Materia. If you can't save the Materia, it's lost for good. This quest can only be done during Disc 2. Red Materia - Red Submarine. If you were able to sink the red sub during the return trip to Junon Town in Disc 2, you can capture the huge Red Materia from the sunken submarine at any time during Discs 2 or 3. If you weren't able to stop the sub, then this Materia is permanently lost. While you have to get two of the Huge Materia in order to make the game progress during Disc 2, you don't need to collect all four of them. However, you can get the powerful 'Master Materia' from the Huge Materia, as well as the strongest Bahamut summon materia, 'Bahamut Zero', so it's advisable that you try to find them all. You can receive the following materia from each Huge Materia: NAME DESCRIPTION PREREQUISITES Master Magic Cast any magic spell Huge Green materia and a 'master' level for all 21 magic materia. Master Command Use most commands Huge Yellow materia and a 'master' level for seven command materia (see below). Master Summon Use all summon spells Huge Red materia and a 'master' level for all 16 summon materia. Bahamut Zero A summon materia Huge Blue materia and the Bahamut and Neo Bahamut summon materia orbs. Once you've fulfilled the prerequisites to get a certain master materia, simply return to Buugen Haagen's observatory in Cosmo Canyon and touch the correct Huge Materia Pick the first option and the screen will glow; pick the top option to get your master materia or the bottom option if you want to get that particular master materia later. You do have to have all the mastered materia on hand, but it doesn't matter whether they're equipped or not. If you're trying to get Bahamut Form Zero, then all you have to do is touch the huge blue materia and you'll automatically receive it after choosing the first option; you have to get this summon spell before you can receive the Master Summon materia. There's good news and bad news, though: - All of the Master materia do not have level stars, so you can't simply 'master' them and get a second Master Materia. Wearing one doesn't affect your statistics, either. - When you receive a Master materia, you lose all the materia that you mastered. This means that not only will you be left with a bunch of low-level materia (since you get another materia of the same type when you master it), but you'll have to master each of them if you want to get a second Master materia of that type. The good news is that if you have two mastered orbs of the same type (say, two Fire and you're trying to get the Master Magic materia), you'll only lose one and keep the other. So, if you have two mastered Kjata materia and you get a Master Summon materia and want another one, you'll only have to level-up 15 orbs instead of 16 since one is already mastered. Individual notes on the Master materia: - If you affix a combination materia like Affect All or Random Magic Strike to the Master Magic orb, it will affect all the spells! However, not all combination materia work with each spell. - When you master a Summon materia, you can call a particular summoned beast five times. With the Master Summon materia equipped, you can summon any beast an infinite number of times (providing you have the MP for it)! Like the Master Magic materia, Combination materia attached to this orb will affect all summon spells. - You only have to master the Steal, Sense, Throw, Morph, Deathblow, Manipulate and Mimic materia orbs in order to get the Master Command materia. This may sound good, but then again, all you get are the above abilities of those materia: this orb won't let you use other commands like Double Cut, X Item, Enemy Skill, or Slash All, for example (but you can equip these seperately, if you like). - And of course, there are no Master Combination or Master Independant Materia