Go to Shadowfang Keep and obtain the Commander's Holy Symbol from Commander Springvale, 5 crates of Moonsteel Ingots, and 5 Deathless Sinew.
Your time as an apprentice has come to an end, <name>. You are ready to advance to the rank of adept, to become a full blood knight in service to Silvermoon.
To honor your accomplishments, the warchief has commissioned his personal smith to forge a weapon for you.
The cursed Shadowfang Keep in Silverpine Forest is the only place to get the materials you'll need. Travel there and recover the holy symbol of Commander Springvale, a supply of moonsteel ingots, and sinew from the ghouls and geists there.