Irrilion is the second hidden world
HOW TO GET THERE: WARNING MAJOR SPOILER Edit
Step 1: Withdraw 100 (250 if antisocial) gold into your inventory Step 2: Go to whitestone.
Step 3: Go to the coordinates of: 531, 57.
Step 4: Enter the building you will now see, and use the ladder.
Step 5: You should be on the beach now. Hit [Tab] and send your avatar to the coordinates of: 412, 20 (Yes, this is IN the water)
Step 6: Enter the Cave.
Step 7: Walk through the cave until you see a ticket booth.
Step 8: Follow the arrow on the ticket booth until you see an NPC.
Step 9: Pay this NPC 100 gold (250 if antisocial) and he will send you on the boat to Irillion!