Mask of Truth

The Mask of Truth is a mask featured in both Ocarina of Time and Majora's Mask. Its distinctive design prominently features a Sheikah eye symbol.

Ocarina of Time
The mask is gotten in Ocarina of Time by selling all of the sellable masks in The Happy Mask Shop. In this game, the mask has the power to allow Link to speak to Gossip Stones to learn new things about the world and its characters.

Majora's Mask
In Majora's Mask the mask imbues the wearer with several abilities, one of which is the ability to be able to read animals' minds, although this isn't a particularly useful skill except in the Doggy Race to see which dog might win. The second ability is the aforementioned ability to talk to Gossip Stones.

Obtaining the Mask
Simply complete the Swamp Spider House located in Woodfall to be rewarded with the Mask of Truth. Note that this requires several items which aren't available until later in the game.