Dracoshield

Dracoshield （竜の盾 Ryū no Tate） is an item in the Fire Emblem series that raises the user's Defense stat by 2 points, and disappears after one use. Dracoshields are good for units with poor defense, and are usually quite rare. It is best to give one to a unit that has poor defense growths. You can usually obtain one by killing an enemy or boss, visiting a village, buying one (Fire Emblem: Radiant Dawn, & Fire Emblem: The Sacred Stones) for 8000 gold, or in some cases, stealing from an enemy. You also obtain one in Fire Emblem: Radiant Dawn when Leonardo joins your team on the fourth turn of the Prologue - Under Grey Skies and in Fire Emblem: The Sacred Stones when Ewan joins at Chapter 12, Landing at Taizel. (Ephraim's] route only)

In Fire Emblem Gaiden, Dracoshields are an equipable item that raises defense and resistance by 13.