Hilgigars' Siren Flute

[PuPu]

Lou, according to a guide on GameFAQs, it says that if you get a Gold Chocobo before going through the Desert Palace part with Kuja, the game will glitch, skips all the parts of Oeilvert and Desert Palace, including Ark and Valia Pira, the Blue Narciss turns into the Hilda Garde III, and Garnet/Dagger is permanently stuck in the form where her commands fail a lot.

Here's the link:

Gold Chocobo Bug FAQ

So spirit helps steal rate. What else does it do, exactly? Point being: is it worth keeping those rebirth rings and pearl rouges equipped during level-up?

The Spirit stat lengthens the amount of time good status effects last, shortens the amount of time bad status effects last, increases the chance for a bad status to miss you, and decreases the chance for a bad status to miss the enemy. It makes your Trance gauge fill up faster. It also makes the gauge deplete faster when you enter Trance, but you get Trance more often so it kind of evens out. It increases the amount of HP you receive when you are revived with Pheonix, Revive, Auto-Life, Life and Full-Life (not a Phoenix Down or Phoenix Pinion). And it increases damage done by Spare Change.

Spirit also decreases the damage done by magical attacks such as Fire, Blizzard, Thunder, and certain enemy magical attacks like Tidal Wave, Neutron Ring, etc.