I have a Shield of Expression (XGtE, p. 139). The description I have of it is the following:
The front of this shield is shaped in the likeness of a face. While bearing the shield, you can use a bonus action to alter the face’s expression.
If I check the description of a shield, I have the following:
A shield is made from wood or metal and is carried in one hand. Wielding a shield increases your Armor Class by 2. You can benefit from only one shield at a time.
What is the most logical material this specific shield could be made of?
I'm asking because in my last session, Heat Metal caused me a lot of troubles...