Dynasties

Go to the main menu -> dynasty profile -> the second tab at the bottom -> dynasty weapon. There, where you assign dynasty weapons to heroes, there is a list of them (a list of weapons you have found). Select the one you are interested in, and a list of bonuses will appear on the right. To view its description, right-click on it. It's inconvenient that you can only view it from the main menu; it would be better if it was available everywhere.