The Dragon Scale Shield is an artifact from Heroes of Might and Magic III, Heroes of Might and Magic IV, and Heroes of Might and Magic V.
Heroes III[]
Held with the left hand, this item increases your Attack and Defense skills by +3.
Heroes IV[]
Gives all friendly creatures +30% to their Melee and Ranged Defense and the Fire Resistance ability. It also gives the hero +3 Melee and Ranged Defense.
Heroes V[]
Adds +3 to hero's defense and increases initiative of all small creatures in hero's army by 5%.