If you lose your lance, you can get another from any of the Lance Racks near the stables or in the Sunreaver Pavilion.
Argent Champion defeated
Description
You are nearly ready to compete in the grand melee. To prove yourself worthy of this honor, you must defeat a champion of the Argent Crusade.
Go to the stables outside the pavilion, equip your lance, and mount up. Speak to Squire Danny at the Argent Valiants' Ring on the western edge of the grounds. The squire will call out your opponent when you're ready.
After the battle is concluded, we will speak of the outcome.
Rewards
You will receive: 13 23
Progress
Have you overcome the Argent Champion?
Completion
You have proven yourself worthy of the title of champion, <name>. You will compete at the tournament's highest level, riding in the grand melee and crushing the competition under the banner of <Capital City>.
After completing "The Valiant's Challenge", the following quests open up allowing players to repeat the valiant stage of daily quests (steps six and seven) for the other factions with which they have not yet earned the right to champion: