A whistle carved from a blue stone from a place you have never seen or known. Carved upon its surface are golden musical notes. 

It is believed to have been used by an ancient sea warrior to protect a loved one when they went to war. Some believe its part of the heart of Lir given to Brighid to protect her when they weren't around. However due to its musical nature it always finds its way into the hands of a bard so who knows what story is true if any.

Upon attunement you gain +3AC and upon use of the whistle you can cast the shield spell. 

Notes: Bonus: Armor Class, Upon attunement you gain +3AC