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You need two level four keyspheres to get full life. or at least two keyspheres, dunno if they're both fours. It's in rikku's grid, and like the first thing inside the lock is a luck+ sphere. (aha, according to my handy map of the sphere grid, it's two fours and a three on one side and three fours on the other)
You weren't playing on the expert sphere grid, were you? or whichever one in Internation that isn't the same?
Behold the Void, yeah, sure you could do it, but it's easier to earn money in zanarkand, and then you get to walk all the way back to the calm lands. usually right after the calm lands people have no gil from yojimbo, or enough for a single bribe. But it's not really all that important, though, really:) what's important is the insinuation of double casting holy. I'm still thinking that's not possible.
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by the way, it's probably a good idea to hold onto level four key spheres for as long as possible. Apart from the Omega Ruins, where you can get up to twelve by sacrificing an opportunity to get other items, and a few other selected locations, the only way to get them, at least in the American version, is by defeating Nemesis, and that's incredibly hard.
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except there's the whole bribing the chimaera brains, which is not difficult at all, but does require massive amounts of gil.
which fortunately is easy enough to get.
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Bleh, I'd forgotten that, probably because I never actually used bribery much :p
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Bribing Chimera Brain doesn't require that much gil, compared to bribing Malboros[Wings to Discovery] and especially Sand Worms[Winning Formula]....
I usually just go beat Mimics for money or battle One-Eye for dozens of times and gets dozens of Triple AP-weapons which can be sold for 22-67 000 gil :)
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I like the kottos+ auto regen armor way, myself.
mostly because I was proud when kottos quit killing me every single time.