emerald and ruby both have 1,000,000 HP. 64x777=not as much as one million. but it would be very useful anyway. can you get it twice in one battle? because if you have 2 peices of materia equipped with 9999HP and one of them is some sort of cure materia you could go into lucky 7's when emmy uses aire tam storm and then heal and wait for emerald to use it again. and im pretty certain that two lucky 7 beserks would defeat emerald weapon. ruby weapon will counter though and remove the lucky 7's beserk mode. but its a great help. if you use it in battle and the battle isnt over when 64 attacks are performed does the character's HP go down to 1?