Obsidian is an earth pony guard who can be found at the top of the Crystal Castle in the Crystal Kingdom.
He is the only guard pony in the castle who is wearing bronze armor, with the back plate left out.
- "Be quick with it, time is of the essence."
- "Are you the courier sent for me?"
- "Communication is an essential asset of war. Speak."
- The stone called obsidian is a naturally occurring form of volcanic glass, typically black in color.