Time: Any
Frequency: Always
World name: Diabolos
Character name: Carmilla L'fanu
Race: Lalafell M
NPC name: N/A
Monster name: N/A
Class/Level: Black Mage Lv. 50
Party or solo: Both
In-game time: Any
Area and coordinates: The Goblet (10,10)
Steps:
1. Acquire a house in The Goblet, any ward, plot 7
2. Use the exterior wall Oasis Cottage Wall (Composite) with the fence Oasis Fence
3. Go to this corner shown in the map (1, 2) and try to fall into the right side of the corner
4. Once inside you will be stuck unable to move unless you teleport away.

Note, I was able to reproduce this in a house in The Goblet Ward 1 (subdivision) plot 50, using the same wall and fence, haven't tested with any other race other than Lalafell M.