Crystal Disk

Crystal Disk is an item in Sailor Moon Crystal.

Characteristics
The Crystal Disk is an item that is given to the students of the Crystal Seminar, that was said to enhance skills and intelligence. However, it was from the Dark Kingdom and would actually brainwash and steal energy from the students who used it.

The message on the disk said "Gather... Silver... Sacrifice yourself for our great ruler, and collect information regarding the Silver Crystal."