A Millisphere looks like an extremely small light-blue sphere with two eyes emitting vibrations. It can be seen by the ordinary eye and is therefore not microscopic.
A Millisphere's vibrations are the deadliest of all the Small Spheres. It's vibrations are the only things that make it visible. If it does not emit vibrations, it cannot be seen.
- The prefix "Milli" means "One thousandth of one".