| ID | 77 |
| Name | OBSIDIAN SOULSTONE |
| Power | 5 |
| Ability | Reveal your opponents' hands, then choose a revealed card or a card in play. Enduring: The chosen card loses all of its abilities. |
| Lore | A dazzling stone of obsidian that is imbued with the soul of a shadow eater. The stone is said to be a portent for souls, and simply being near it slowly eats away at your soul until it is entirely consumed within the stone. Origin unknown. |
| Clarification | The chosen card only loses its abilities as long as this card remains on a Space and retains its Enduring ability. If the chosen card has its abilities turned back on and it is in a Space, you do not activate the ability, but the text related to Enduring will turn on. |