"All" Materia.

The "All" Materia is a materia in Final Fantasy VII that allows the player to cast a spell on every enemy. It must be paired with the spell in order to work. It can be used up to 5 times when it is mastered.

Where to find All Matera
All Materia can be found at different locations, such as on the cargo ship to Junon, after the party regroups, in the place Yuffie Kisaragi was blocking. It can be found at the Beginner's Hall in Junon, first visit.

What is materia?
Materia is what players in Final Fantasy VII equip to characters in order for them to preform special spells or abilities, such as the "fire" materia which teaches the spell fire. Some materia teach summons or commands. The Item command can be replaced by "W-Item" a materia found in the Bone Village, or while sneaking into the Shinra Headquarters.