Head to the Concordium Tower in South Qeynos at night. Go through the red teleporter and click on the locked box on the table on the lower level at ( 703, 42, 106 ) Copy/waypoint 703, 42, 106.
This step can be done during the day, but an even con hostile mob will spawn and attack you. If you don't want to fight, run it outside and a guard will kill it.
Upon talking to Towser, you will be warned about the consequences of betraying.
If you accept the consequences, you will automatically receive the next quest and be transported to a special instanced zone version of the Concordium Tower.
Rewards
Credits
EQ2i credits the SOE/DBG Forums for some of the information in this article.