Dynasties

Go to "About the Dynasty" -> the second tab (where you create heroes), click on the "Dynasty Weapon" button, and you'll see a list of all the weapons you have. Click on a weapon with the left mouse button, and you'll see a list of all the properties for each level in the panel on the right. If you click on one of the properties with the right mouse button, you'll see its description ;).

If I remember correctly, "Griffin's Heart" provides immunity to harmful effects on the morale of your troops :).