All Lucky 7's
Any character whose hit points are reduced to 777 after an attack gets the All Lucky 7's effect. The character goes into a mad rage and begins to attacking the enemy nonstop, landing a hit for 7777 points of damage each time.
To get this you must first get your character's HP over 7777. This means the All Lucky 7's effect can only happen to high-level characters or those equipped with several "HP Plus" Materia. You'll also need a lot of luck since someone's attack must nkock that character down to exactly 7777 HP. It can happen, but it's not likely to happen when you'd like to. Also, aftter any battle where a character's Hit Points are 7777, that character's HP is reduced to 1. So you can't carry the All Lucky 7's effect over to another battle.
Note:
It may be possible to keep
this effect if you can find a way to equip your character with Materia that alter the
character's HP level so that it's exactually 7777. So far I haven't found a way to
do it, but that doesn't mean it is impossible.