Cleo

[Cleo takes out a pencil from her art kit and jabs one of the orbs that a solid black. Like an infection the darkness crawls all over the pencil until it too is as dark as the orb. Cleo herself is unaffected despite still holding the pencil. Cleo obtains an obsidian pencil.]
Wow! It seems that whatever touches one of the orbs turns into what the orb is made of!