The purple ball must be destroyed. As long as it exist I can not rejoin the traveler and awaken it. The purple ball contains the heart of the darkness. After the last great battle with the darkness, both the purple ball was left incomplete. The darkness within the purple ball found a way to corrupt guardians and their light and uses this power to link itself with the rest of the darkness. I was thrown deep within the darkness. The purple ball's power keeps me from reconnecting with the traveler. Guardians, you must destroy the purple ball so that I may once again power the traveler and defend Earth and its people. To do this the soccer ball and purple ball must be fused together
Read this for more information on both the purple and the soccer ball
https://www.bungie.net/en/Forum/Post/67477022/0/0
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Nay errant one, your vision has been clouded by the deluded whisperings of one gone astray. The errant one (soccer ball) with patience and forbearance, will see the error of its way and return to the bosom of its fellows. For your own salvation Guardian, cast aside your hatred and anger, cleanse yourself for the coming conflagration and return to the grace and light that is the Holy Purple Ball. Blessed be the Holy Purple Ball!