It's also handy to know you can change it so you can interact with NPCs by left-clicking. This way you won't accidentally attack those tools that sit on top of the seed vendor and get ran over by guards.
Item Level 1
Binds when picked up
Unique Use: Throw a hard shell, dismounting the target. Unusable on targets above level 94. (15 Min Cooldown)
Dropped by: Nessos the Oracle
Drop Chance: 17.74%
As a Druid, it is perfect. Plus, I can fly up, use the stone to dismount someone flying WAY UP THERE, cast the stone, and then shift back into a bird before I fall. Doesn't create aggro or flag you.