Platinum Games Hideki Kamiya' has announced Scalebound, a monster hunting title featuring dragons and hydras among other giant monsters.
No actual gameplay was shown but the title seems to take a lot of cues from the Monster Hunter series. You play as the blond haired protagonist pictured at the top of this post. At one point he fires an arrow coated in green fire and the monsters fight each other which can presumably be used to your advantage during gameplay. He also coats himslef in some kind of armour and we see him ride a dragon near the end who breathes the same green fire as the arrow.
We'll share more details as we have them.
The CGI gameplay trailer is included below.