The Legend of Zelda: Breath of the Wild - Expansion Pass

The expansion pass is the only way to purchase the DLC packs for the game.

The pass includes 2 DLC packs: The Master Trials and the Champion's Ballad.

DLC Pack 1: The Master Trials.
Master mode, a new game mode which makes all monsters stronger adds powerful new enemies.
The Trial of the Sword is a new challenge where you start with no equipment, and has to fight through 45 rooms of enemies.
Hero's Path allows you to see the path you've travelled.
Travel medallion is a new item which allows you to register your location as a travel gate on the map.
There are also several hidden items for you to find. The following items, which pay tribute to The Legend of Zelda series, can now be found scattered across Hyrule: Majora's Mask, Midna's Helmet, Tingle's Hood, Tingle's Shirt, Tingle's Tights, Phantom Helmet, Korok Mask, Phantom Armor and Phantom Greaves.

DLC Pack 2: The Champion's Ballad.
The Champion's Ballad. Following the guidance of an unseen voice, Link encounters a new test: the Divine Beast Tamer's Trial. Take hold of the One-Hit Obliterator to clear out monster encampments, discover new shrines, conquer a huge dungeon and more. Overcoming all these obstacles will earn you the power to call upon the Master Cycle Zero.
Nine hidden items for you to find. The following items, which pay tribute to The Legend of Zelda series, can now be found scattered across Hyrule: Island Lobster Shirt, Ravio's Hood, Zant's Helmet, Phantom Ganon Skull, Phantom Ganon Armor and Phantom Ganon Greaves. You can also find the Royal Guard Cap, Royal Guard Uniform and Royal Guard Boots, which were once worn by Hyrule's royal guards. Ancient Horse Gear.
The Ancient Bridle and the Ancient Saddle are hidden in treasure chests somewhere in Hyrule, waiting to be found.