Which hero can transform into a dragon?

The Dota 2 hero who can transform into a dragon is Dragon Knight.

Dragon Knight is the warrior Davion, a knight whose life changes after he encounters the ancient dragon Slyrak. Rather than simply defeating the dragon, Davion becomes bound to him, gaining draconic powers while retaining his human identity. This transformation is represented by Dragon Knight’s ultimate ability, Elder Dragon Form.

When Elder Dragon Form is activated, Dragon Knight changes into a flying dragon and gains enhanced combat capabilities. The form’s effects have varied across Dota 2’s history and ability updates, but its central purpose remains the same: temporarily turning the melee knight into a much more dangerous ranged dragon.

Jakiro is already a two-headed dragon-like hero, which makes it a common distractor, but Jakiro does not transform into a separate dragon form. Winter Wyvern is also a dragon, while Viper is a winged reptilian creature; neither is the hero identified by the transformation ability. Dragon Knight’s Dragon Blood ability further reinforces his connection to dragonkind.