a dark red dragon with a diamond-shaped head and hazel eyes and a spiky spinal tale

This is Renagaren, he is a devil to thoes not on his side or thoes in the villages who hide. Some might not believe the tale of The Retchaed Renagaren, but untill they see him from his cave or wondering the dense woods they'll run for their lives. So may say The Renagaren can be friendly, but only to thoes who have a good and righteous and wholesome soul.