Dark Artifacts

The two Dark Artifacts are two objects created by Anu to lock his foes, Ciemno and Tathamet.

Despite their similar mission, the Dark Artifacts can't be beared by the same entity as the two Primordial Beings could ally and destroy the host, Ciemno will take the entity as her host while Tathamet will take the Herald as his host.

The Stone of Tathamet
The Stone of Tathamet is the first Soulstone ever made, it was created by Anu himself to lock a fragment of Tathamet's conscioussness, he gave the stone to Lucifer

The entity who possess the Stone is able to manipulate Hell itself, they also gains demonic powers which equals with the angelic powers of an Ophanim, it also allow the bearer to know the location of the Great Evils

However, the Stone can easily corrupt someone, the corruption of the Stone isn't faster than the corruption of the Mark but the impatient and wrathful nature of Tathamet make his corruption more direct than the corruption of Ciemno who have a calm thoughtful behavior, moreover, Ciemno is weaker than Tathamet.

The greatest feat of the Mark is making fall Lucifer, the fear of uselessness that the Ophanim had made easy his corruption.

In order to purify himself from Tathamet's influence, Lucifer gave the Stone to Cain when he did the pact with him, as Tathamet wanted a massive murder tool, he turned Cain into the beast he was until his meeting with Colette.

The Mark of Ciemno
The Mark of Ciemno is the first curse ever made, it was created by Anu himself to lock his sister, Ciemno, he gave the mark to Michael

The entity who bear the Mark is able to manipulate darkness itself, they can know where Ancient Ones are and can understand the language of the Darker Ones.

However, the Mark can easily corrupt someone, the corruption of the Mark isn't slower than the corruption of the Stone but the impatient and wrathful nature of Tathamet make his corruption more direct than the corruption of Ciemno who have a calm thoughtful behavior, moreover, Ciemno is weaker than Tathamet.

The greatest feat of the Mark is turning Michael into the Archangel of Fear and of Darkness

However, it's now Raguel who bears the Mark

Their Searchers
Among the ages, many entities began to search the Dark Artifacts either for their powers or to free the Primordials they lock
 * Great Evils: The Great Evils search the Stone since their birth as they know the Stone, if destroyed by a Herald of the Beast, can ressurect Tathamet in the body of the Herald
 * Shedims: As their masters search it, the Shedims search the Stone to free the being they come from.
 * Ancient Ones: The five children of Ciemno search the Mark and how to destroy it as they want to free Ciemno, they currently don't know where Cain, and the Mark, is.
 * Michael: When Michael falled and became the Archangel of Fear and of Darkness, he search the Mark along with the Ancient Ones.
 * Freeing Horde: A secret organization composed of various species who seek the two Artifacts for their powers.