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All Lucky 7s

From Final Fantasy Wiki

All Lucky 7s in action
All Lucky 7s is a special Easter Egg status that appears only in Final Fantasy VII. It occurs when a character's HP lands on exactly 7777, causing an in-battle message to say "All Lucky 7s". When this happens, the character begins rapidly attacking all enemies in the battle, with each hit doing 7777 damage. The character cannot be controlled during this barrage of attacks. The character's name also begins to flash in the battle menu. Afterwards, all subsequent attacks will always hit for 7777 damage until the character's HP changes. After the battle ends, the character's HP falls to exactly 1, so that the effect cannot happen infinitely.

Note that enemies themselves can enter a Lucky 7 state, where all of their attacks will do 7777 damage upon connecting with the player, making it an extremely dangerous state.