Achieving one's personal legend is fraught with difficulty and challenges for everyone. Following your desires is going to have unexpected hurdles that must be surmounted. The tribal war is just one of the many hurdles that Santiago faces. Santiago is able to assist in the tribal wars because he is in touch with the Soul of the World. If he ignores the omens that he receives through this connection, he risks severing it all together. That is why he is compelled to risk his life by taking part in this conflict. Paulo Coelho uses tribal war as an allegory for the dangers and risks undertaken in pursuing a personal legend.
Personal legends are just that, personal. While Santiago receives help from many others in order to pursue his personal legend, it can only be achieved by him alone. That is why the alchemist, after teaching Santiago what he can, leaves him to reach the pyramids all by himself.
The alchemist tells Santiago a story about the Roman Emperor Tiberius. One night an angel came to...
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