Stone of Agony

The Stone of Agony is an item featured in Ocarina of Time. It is a magical stone that will vibrate when an unseen secret is close to its holder. It has a unique shape, like that of its real-life counterpart, the Nintendo 64 Rumble Pak, and also possesses the symbol of the Triforce etched upon its surface.

Location and Uses
Link acquires the stone as a reward from one of the cursed residents of the House of Skulltula in Kakariko Village after destroying 20 Gold Skulltulas. Possessing the stone within the game will activate the Nintendo 64 Rumble Pak and cause the player's controller to vibrate when close to a hidden secret. Majora's Mask made it so that the item itself was not necessary; the controller would intrinsically shake on its own whenever Link came close to a hidden secret.

The stone is a companion relic of two other items: the Lens of Truth and the Mask of Truth. When all three items are used collectively, a traveler can often find his way much easier and have a firmer grasp of the true nature of their surroundings. The stone material itself was cut long ago from an enchanted Gossip Stone of Hyrule, which is where it acquires its sensitivity to nearby secrets and clues.

The Stone of Agony is present in the Wii Virtual Console release of Ocarina of Time, but since the Wii does not support the functionality of the Rumble Pak, the item serves no purpose whatsoever.

Shard of Agony
In Ocarina of Time 3D, the Stone of Agony is replaced by the Shard of Agony. It serves the same function as its predecessor; however, the Shard of Agony will give visual and audio cues instead of the rumble feature. Whenever Link is close to a secret, a pinging sound will play, and an icon of the Shard of Agony will appear in the top-left corner of the screen.