Denath

Denath appears in the Demon Slayer and Shadow of the Storm quests, where he is trying to raise the demon Agrith-Naar. In fact, it is revealed he is Agrith-Naar and was trying to free himself from the human body he was trapped in. After unwittingly freeing Agrith-Naar, the player must re-summon him so they can kill him once and for all.

Denath was among the dark wizards attempting to free Delrith from the stone table. Although they were successful at freeing the demon, Denath fled after the player showed up with the weapon Silverlight.

During Shadow of the Storm, it is revealed he has fled to the Ruins of Uzer, where he has been building up a following of evil (but actually quite friendly) people. They aid him in the summoning of the demon Agrith-Naar, but during the ritual, he steps in the middle and is transported to the Infernal Dimensions, meaning that he is Agrith-Naar himself.

After most of the members of his group get killed, the same adventurer who killed Delrith summons him with a new group of people. At the summoning, however, Agrith-Naar kills Matthew, a former member of the group, after already having killed Josef in between the events of quests. As Agrith-Naar dies, Denath is gone for good as well.