Tones
Tones are the multi-functional currency of Acos. They are shaped like small, rectangular, multi-colored plates and have a variety of uses directly beneficial to the pocket world's inhabitants.
'Mechanics'
The variety of tone colors are not different from one another at all. They are only colored differently to invoke a feeling of "treasure" that makes people want to pick them up!
Tones are very small, and multiple tones can be held in one inventory slot. However, it is ideal to store them in The Cube because tones carried by player characters are not accessible by the others!