What special fate has been predicted for mari djata as the son of sogolon

We learn that Sundiata's mother, Sogolon Kedjou, whose marriage to Maghan Kon Fatta foretells the immortality of Mali through her offspring. Sundiata didn't walk until after his mother was admonished when she asked for some baobab leaves from Maghan, whose own son picked the leaves from the baobab tree. When Sundiata learned what had happened from his tearful mother, he strapped two iron braces to his legs, stood, then dragged a baobab tree outside Sogolon's house. 
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