Gnolls are the literary descendants of Lord Dunsany's "gnoles", who were clever, evil and nonhuman. Gary Gygax writes in the earliest edition of Dungeons Dragons (1974): "A cross between gnomes and trolls (...perhaps, Lord Dunsany did not really make it all that clear) with +2 morale. Otherwise they are similar to hobgoblins..."
Dust Stalker: Unknown origin, the Dust Stalker is believed to be a conjured or summoned creature that stalks a target from an astral plane, eventually to cross into the physical world and consume the heart and sometimes the soul of the prey. When crossing into this world, it creates a cloud of bone dust that covers everything and gives some warning of its immediate arrival. [Bonepowder Ghoul]