This quest is not available in game.
For 20 Insignias of the Dawn and 20 Insignias of the Crusade you may choose an item from the Argent Dawn's treasure cache.
Greetings, friend. Have you insignias of the Dawn or the Crusade that you would like to redeem for items of power?
I must warn you; purchases made at honored reputation with the Dawn come with a fairly prohibitive surcharge. I would advise that you gain a better reputation with the Dawn before moving forward with your plans.