There is a special EXP event every day at 6 specific times, lasting 30 minutes each. During this time frame, EXP Coins (shown below) will spawn all over a particular starting city. They have 1hp each, and they provide large amounts of EXP. 

We recommend that you take advantage of Training Esotericas and Hyper Exp Stones when you join!

00:00 AM - 00:30 AM City of the Lost
04:30 AM - 5:00 AM Etherblade
09:00 AM - 09:30 AM City of the Plume
01:00 PM - 01:30 PM Tellus City
05:30 PM - 06:00 PM City of Raging Tides
10:00 PM - 10:30 PM Dawnglory