Prismatic Bauble
Source: Vendor. Last 20sec with 20min CD? WTF is this?
The Prismatic Bauble is a Legion toy that creates a rainbow trail effect and is sold by the Mad Merchant in Dalaran.
Guide awaiting review
Find the Mad Merchant
Head to The Wonderworks Toy Shop in Dalaran and find the Mad Merchant near Jepetto Joybuzz at 43.9, 46.65. The Mad Merchant spawns on a random timer ranging from as short as 4 hours to several days, and after someone purchases from him he remains for roughly 1–2 hours before despawning.
Purchase the Prismatic Bauble
Buy the Prismatic Bauble from the Mad Merchant for 
250,000 Gold. The toy has a 2-minute cooldown and lasts 20 seconds, creating a rainbow trail behind you.
Tips
Using the Prismatic Bauble breaks stealth, so if you want to use it alongside a stealth-breaking ability like Sprint, add a conditional to your /use command to prevent unintended stealth breaks.
When macroing the Prismatic Bauble with a targeted spell such as Heroic Leap, place the /use Prismatic Bauble line before the /cast line in your macro to avoid cancelling the spell's targeting action.
