Red Hart

The Red Hart is a domesticated animal which can be used as a mount by the Inquisitor. The Red Hart is available as part of the DLC that comes with Dragon Age: Inquisition Deluxe Edition and Dragon Age: Inquisition Inquisitor's Edition.

Official description
Navigate the perilous, living world atop this great-horned beast.

Acquisition
You must first initiate the quest Horses for the Inquisition and complete In the Saddle quest, before you can see the Red Hart mission on the War Table (Orlais) to unlock this mount.