[There's a basic note that gives instruction that the 'power' activates upon the user 'willing' it to do so, including the details of the power as well as the name of the item:

Flowery Necklace - A necklace crafted carefully and rather intricately. Created with a diligent focus, it also has the following perks:

Gives a magic shield each time it's used. Only 'one' shield can be up at a time.

Protects the user from six medium attacks, before breaking. But, if the user were to take a mortal blow before that point, this item instead breaks and renders the blow non-fatal.

There is also a personal note sent along that reads:

"I am quite certain that Emblem Corrin would be happy to lend you her power if you were to wear the emblem ring and call upon her. Please do not hesitate to do so.

Take care, and I will see you soon."

- Zelkov]