The dragon scale is a scale from Ferno the fire dragon. When put into Tom's magic shield, the shield is protected from fire, very useful in wildfires or when battling fire opponents such as Epos the flame bird.
According to its' card, the dragon scale that is put into Tom's shield is one of Ferno's oldest scales. It is as old as Ferno is-288 years old. It also has a power of 82, a magic level of 137 and a fright factor of 56. Overall, it is not as good as Ferno's card, which beats it in power, fright factor and magic level; and it ties with Ferno in it's age.
The dragon scale was the first beast item Tom got on his quest.