Djabal is Hakeem, the incarnate Dread, The phantasm khalif, king of Prodigies.

Confused, troubled thinking is comprehensible enough after the drink I had taken, but what puzzled me were these curiously vivid phantasm memories that had crept into my mind, and not only the memories that had crept in, but also the memories that had slipped out.

So, taking the dagger in his hand, he softly stole in the dark to the room where Duncan lay; and as he went, he thought he saw another dagger in the air, with the handle towards him, and on the blade and at the point of it drops of blood: but when he tried to grasp at it, it was nothing but air, a mere phantasm proceeding from his own hot and oppressed brain and the business he had in hand.