Extra health and money.
This is really helpful when fighting the first el-gigante don't kill him first take the yellow herb there and use it with a green herb. Then die you will start at the same spot with the health boost but the herb will be back. Fill your inventory and then sell some to the merchant for $3000. The later ones can be sold or given to Ashley. Also it helps if you saved the dog this way you get more time to explore.
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