Elixir of Experience

Elixir of Experience is a treasure that can be obtained by through the Medal Exchange Center. Unlike other treasures, this treasure badge's color is black and its grade is unknown. However, the treasure has three different "sizes": S, M, and L.

This treasure is an "Effect" treasure, which means it is a "One Time effect treasure" that is cannot be equipped, upgraded, nor evolved, but can only be "used" to boost XP.

Trivia

 * This treasure unknowingly confirmed the name of the once-unreleased Tower of Frozen Waves. The description discrepancy is explained because this treasure was supposedly updated alongside with the release of Tower of Frozen Waves. Due to unknown reasons, they delayed the episode, but the description passed the schedule.
 * There is currently no way to obtain this treasure other than the Medal Exchange system. In future updates, this may be obtained from Fortune Cookies.
 * This treasure cannot be upgraded.
 * This treasure cannot be equipped. Selling this treasure gives you 1 and extracting this treasure gives you  3.
 * This is the first 'Effect' treasure.
 * This is the first treasure that can have multiple "sizes" of the same treasure.