You must be at least 5 level to start this quest.
At the Lighthaven Bank (south from the temple) find Kirlor Dul.
Say Work and then Register to him. He will ask if you want to register. Answer Yes and he will give you a registry letter, which you must deliver to one of the two merchants in Lighthaven.
If you choose to give the letter to Sigfried you will be rewarded with Experience Points and if you give the letter to Rolph you will be rewarded with Gold Pieces.
In any case, go to one of the merchants and say Letter. They will give a letter that you must deliver to Lord Sunrock at the city of Windhowl.
Attention: this is a timed quest, so go directly to Windhowl.
When you arrive, find Lord Sunrock (he is located at the house north of the temple entrance).
Say Report and he will thank you and reward you witheither 750 Gold Pieces or 6,000 Experience Points – Depending on who you started the quest with.
Gain :
Note: You can do this quest twice, once registering with Rolph and once with Sigfried.