Added Effect Materia Combinations
The Added Effect Materia is probably the Materia with the most possible combinations and those combinations change whether or not it is paired in your armor or in your weapon. I'd recommend leveling this Materia and mastering it as soon as possible because you'll want duplicates of it for everyone on your team.
I strongly recommend you pair Added Effect with Hades or Contain in your weapon as early as you can. The majority of enemies can't resist the status ailments these Materia inflict and you have a fairly decent chance of applying the status ailments when attacking... It makes things like the Battle Square so much easier they don't even pose a challenge.
Note: According the FF7 wikia the chance of inflicting the status ailments with Added Effect on your weapon is 20%
Note: Very few enemies in FF7 are weak to Slow and Stop as well as Paralyze abilities. Pairing Choco/Mog or Time with Added Effect is EXTREMELY powerful
Where to find Added Effect Materia:
Cave of the Gi - This is the only place in the entire game that you can find the Added Effect Materia
Useful Added Effect Materia Combinations:
Added Effect + Choco/Mog: (Weapon) Attacks paralyze an enemy (Armor) Protected against paralyze
Added Effect + Hades: (Weapon) Attacks can poison, confusion, sleep, silence, mini or toad (Armor) Protects against poison, confusion, sleep, silence, mini and toad
Added Effect + Contain: (Weapon) Chance to petrify, confuse, berserk or paralyze an enemy (Armor) Protect against petrify, confuse, berserk or paralyze
Added Effect + Destruct: (Weapon) Attacks can instantly defeat an enemy (Armor) Immune to instant death attacks
Added Effect + Odin: (Weapon) Attacks can instantly defeat an enemy (Armor) Immune to instant death attacks
Added Effect + Mystify: (Weapon) Attacks can berserk or confuse an enemy (Armor) Protected against berserk and confuse
Added Effect + Poison: (Weapon) Attacks can poison an enemy (Armor) Protected against poison
Added Effect + Seal: (Weapon) Attacks can silence or put an enemy to sleep (Armor) Protected against silence and sleep
Added Effect + Time: (Weapon) Attacks can slow or paralyze an enemy (Armor) Protected against slow and paralyze
Added Effect + Transform: (Weapon) Attacks can cause mini or frog to an enemy (Armor) Protected against mini and frog
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