Quote Originally Posted by chronic_Maniac
When you take the path that has the magic potsand you get out of the swamp area and you see this big beaming light in the bottom of the area go and examine around it for the w-magic.

Limit breaks work like this
learning the second limit breaks on a level requires you to use the first one 8 times. Then to move from the second to a new level requires you to defeat 80 enemies with that character.

If you just want to finish the game you will be able to see omnislash no matter what.... unless you are a wimp and let sephiroth hit you LOL

i am 100% certain that the materia i picked up from the light was not W-magic