Hey there, S99 - Dawnchaser and the Manus Celer Dei were concepts or ideas that have never been comfirmed to be put in the game whether it be currently nor future updates. Both items were merely files in the Destiny Database. Unless [u]officially confirmed by Bungie, never treat any "Un-Official Sources" as something set in stone. [/u] Hope this helps! [spoiler][i]Death is not The Sickness unto death. ~ Soren Kierkegaard[/i][/spoiler]