From Zelda Wiki, the Zelda encyclopedia
Guardian Acorns are small, golden acorns, that are dropped by enemies in Link's Awakening. They appear when Link defeats 12 consecutive enemies without getting hit by one. When Link touches one, the acorn halves all damage Link takes for a certain amount of hits. The duration is only denoted by unique music. It is one of two temporary upgrades available in Link's Awakening, the other being Piece of Power. The Blue Tunic obtainable in the Color Dungeon exclusive to Link's Awakening DX has the same effect, but is permanent.
In The Legend of Zelda and A Link to the Past, the Blue Ring and the Red Mail has the same effect as this item, respectively.
- ↑ "To earn a Guardian Acorn, you must defeat 12 enemies while staying out of the line of fire. . ." (The Legend of Zelda: Link's Awakening Nintendo Player's Guide (Nintendo Power), pg. 89)