Tres

Tres act as a currency in The Legend of Dark Witch franchise.

Appearance
Tres are shaped as butterflies.

Overall
Tres act as a currency in the series. They can be traded at Papelne's shop (and Al's shop in the case of Episode 2). They also power the Enhancement Slot.

The Legend of Dark Witch Episode 3: Wisdom and Lunacy
In Episode 3, Tres replace Syega shards, and are used for unlocking things in the museum. Your total Tres count is shown on the title screen, and the amount of Syega needed for the next unlock in the museum,