Shield of Heroic Memories

This shield is emblazoned with the sigil of Tal.
As you take this shield into battle, you remember enemies you encountered before and gain +1AC against creatures of the same type.
You may attempt to recount past memories of
battles this shield may have encountered in
history. Upon a DC Charisma check, the shield
confers a +1AC against creatures described in
those memories. 3 Failed attempts at recounting
memories not of your own will cause the shield
to be cleared of all its memories.