Giants are said to be the most common in northern Thedas, more specifically in the Tevinter Imperium, but can be often seen in southern areas such as Orlais and Ferelden. Waterways are a preferred location for these creatures. They are described as being "destructive beasts", with the hunt for food as being their primary motivation.
Giants are omnivorous creatures, as they can be found eating foods ranging from meat, grain, and leaves, but do not seem to be picky when it comes to what they eat as it is noted they will eat nearly anything digestible, no matter the texture or taste.
A demon ally of the Red Templars named Imshael operating out of Suledin Keep oversaw a operation to infect several Giants with Red lyrium. The Inquisitor kills them while storming the base. Aside from a red aura there is no discernible difference but they are under the control of the Templars.