Epona is considered a "weapon" because she can team up with Link to attack enemies. Aonuma describes the gameplay experience like this: "By riding Epona, I was able to blow herds of enemies away and gallop swiftly through the fields, and I had a lot of fun trying out this re-imagined version of her in Hyrule Warriors."
"In the Zelda series, players never had a chance to tackle bosses by galloping around them with Epona like in Hyrule Warriors," he added. "So I hope fans will enjoy playing as Zelda characters in a game with a different type of action than you typically find in the original series."
The Master Quest Pack for Hyrule Warriors launches October 16 as part of the game's $20 DLC pass. It also includes other content, including a new scenario, adventure map, and pair of costumes. Three additional expansion packs--Twilight Princess Pack, Majora's Mask Pack, and Boss Pack--will be released later on. If you buy the Hyrule Warriors DLC pass, you'll also receive a free Dark Link costume.