This glitch allows you to enter many previously unaccessible areas in Qeynos Harbor.
Step 1: Go to the front door of The Hall of Steel in Qeynos Harbor.
Step 2: To the left of the door (outside) are four ledges, jump on them in this order:
1. The windosill
2. The edge of the castle wall
3. While you are on the edge of the castle wall, jump straight up
4. The roof of the Hall of Steel
Congratz! You are in the secret area! You can do many things here, such as use the secret enterance to South Qeynos, or walk on the castle wall! First, the secret enterance to South Qeynos...
Step A: Perform steps 1&2
Step B: Walk to the arena wall on the left side.
Step C: Walk next to the wall and fall off the other side of the Hall of Steel
Step D: Double-click on the doors that lead to South Qeynos.
Okay, to get into the arena, it's much more complicated. It helps to have a Scout who has evacuation, a Cleric with Odyssey, or a Conjurer with Call of Hero for this part.
Step A: Perform steps 1&2
Step B: Jump onto the highest point of the Hall with your back facing the arena
Step Ca: Walk backwards to the bottom of the "pyrimid"
Step Cb: Make sure your back is STILL facing the arena
Step D: Make sure mounts or shapechanging spells are turned off
Step E: Turn on the "Sprint" ability
Step F: Run up the slope of the "pyrimid", making sure to jump at the highest point
Step G: Land succesfully on the wall and turn "Sprint" off
Step H: Walk along the right side of the wall, you will soon come to a mage tower
Step I: When you reach the end, look in the bottom-left corner by turning the view
Step J: Look for a little piece of land sticking out of the wall
Step K: Fall down to that land
Step L: Enter the arena by a "destroyed" arch
Step M: Exit the arena by falling through the floor in the middle
IMPORTANT: Falling through the arena will teleport you to the dock, but if you fall down any other "glitchy-hole", it will crash your game!