This quest is not available in game.
Bring 25 Argent Dawn Valor Tokens to Quartermaster Breechlock at Light's Hope Chapel, Eastern Plaguelands.
Brother <name> - your deeds on behalf of the Argent Dawn are far too numerous to be recounted easily. As a fitting tribute, I'll part with one of our special Chromatic Mantles of the Dawn - a version that protects the wearer from all forms of resistible magic simultaneously. Chromatic Mantles of the Dawn are reserved for only the mightiest of the Dawn's heroes!
Bring to me twenty-five valor tokens as a sign of tribute, and I'll give you the finest of all our mantles.