Piece of Power

Pieces of Power, also known as Piece o' Power, are triangular-shaped items that appear in The Legend of Zelda: Link's Awakening and its Game Boy Color port, The Legend of Zelda: Link's Awakening DX. They sometimes appear when Link defeats an enemy. When Link picks up a Piece of Power, his sword begins to flash (both on-screen and on the bottom HUD), and a unique theme plays while it is in effect. A Piece of Power enables the sword to deal twice as much damage to enemies, sending them flying in the process. It also enables Link to move around faster. If Link is wearing Red Clothes, a Piece of Power enables him

The Piece of Power's effect wears off if Link takes damage three times (except for when he falls into a pit or lava), or by switching between locations from a dungeon, cave, or the overworld.

Guardian Acorns are similar items to Pieces of Power in that the same theme plays while they are in effect. However Guardian Acorns increase Link's defense rather than his sword attack.