This is Obsidian, a large earth dragon in the DragonCharm series. He is the largest of the six, with the ability to create supersonic sound waves that will deafen any close range enemies. Obsidian is often very quiet, and will use pictured and maps to show the Riders where to go. He is the best tracker of the group, aiding them in many ways.

His Rider is Jackson, who has to power to see in the dark almost like it was daytime.