"Heart of Darkness": When using this to fulfill the requirements of an Abyssal Concerto, you may treat it as being 1 or 2 cards, and/or treat its level as being any 1 number from 0 to 3.
| Detail | Value |
|---|---|
| Card type | Unit |
| Faction | ATLAS |
| Attribute | Darkness;OWL;Supernatural |
| Level | 0 |
| ATK | 1 |
| HP | 4 |
| STK | 1 |
| Flavor text | Nothing in modern science could explain the newfound reality of the supernatural. |