World Shrinker
From World Shrinker. I'm pretty sure that using this and the Enlarger at the same time will probably cause the server to crash.
The 
World Shrinker is a Gnomish Engineering crafted toy that shrinks your character for 5 minutes.
Guide awaiting review
Craft via Gnomish Engineering
The World Shrinker is crafted through Gnomish Engineering. Learn the schematic and gather the required materials to craft it, or check the Auction House for a pre-crafted copy.
Use the Toy
Activate the World Shrinker from your Toy Box to shrink yourself for 5 minutes. Note that the toy cannot be used while mounted, and using it alongside the 
World Enlarger simultaneously is not recommended.
Tips
The warning 'Overuse may result in permanent shrinkage' is purely flavour text and has no actual in-game effect.
