From Guild Wars 2 Wiki
Rotten Eggs are consumables that grant the ability to throw up to six eggs. Remaining uses are tracked via the Eggs Remaining effect.“
Double-click to consume.
Double-click to open a carton of rotten eggs.
— In-game description
|1||Throw Egg||¾||No skill description found.|
- Only using the Rotten Egg in the inventory (from one of Trick-or-Treat bags) is counted for Tricks and Treats collection achievement. The bundle picked up from the ground is not.