There Are Two Audiences And Here's How You Appeal To Them

1) "We have to go to the demon world!"
2) "We have to go to the demon world, which is made up of seven layers. Each layer is divided into four distrcts, and each district is controlled by a lord who has under him one general and his two captains, a chancellor, and five tribunes."

Addendum

Unless it's one of those scifi series where mummy lords sit on the command thrones of pyramid-shaped space dreadnaughts that are so common today.

Publishing Advice

If you're going to infuse a few unlucky copies of your book with diabolical energies, try to make it a science fiction story so people really don't expect it.

Seven Years Week by Week

The pane fell to the ground and burst apart as if it never had more solidity than a lake of dreams. One of the workmen, Amdin, stared in shock. Urkan, the other, laughed.
"That's seven years for us, Amdin!"
"This was magic glass, not a mirror! We're in a lot of trouble here! We'll be lucky to get off with seven years of bad luck!" Urkan's laughter cut off. "I didn't say anything about bad luck."
"Huh?"
"Amdin. We have seven years to train to defeat the demon lord who was sealed in that glass."
"Huuuuuuh?"

Week 1
>Train
>Job
>Quest
>Rest
>Go Into Town
>Options
>System

"Huuuuuuuuuuuuuuuh?!"
Finis

Aerial Selection

Once, people ran from every strange shape, for it was always some monster or fiend. The most mysterious, it is said, was a great bird, if it could be called that, for it was larger than any bird or barn and never flapped its wings but only held them in different positions. Moreover, it did not cry on its constant travels. It only looked down, and if a bird could sneer, it did.
It passed over every city, every village, the farms and shacks too each in its turn, and when a visitor from abroad came it came without fail to investigate. At first the people feared it as much as the manticores, gargoyles, harpies, and all the other dreadful enemies of mankind, but as it never killed anyone or hauled away a cow, they came to feel reassured when it passed overhead, much as when they caught sight of a neighbor hard at work. Some began to offer prayers they hoped it would carry to better places.
Then one day a traveler arrived, firm of hand and step. The great bird saw him and without hesitation entered a dive, and all were shocked who saw it save for the target alone, who unsheathed his sword and cut apart that ranger of the skies with one blow though it seemed impossible given its size. Yet the bird split cleanly into two, and inside it was empty and bloodless. And one among them who was the oldest and wisest advised the traveler to go inside.
He did, and pulled the two halves together, and they joined together as if never cut. The bird then soared straight up to take the battle to heaven which a host of demons had conquered, and for once mankind hoped.
Finis

The Dilemma at the Heart of Man

I think of myself as someone who doesn't care much for non-human fantasy races, but most of my favorite fantasy has non-human races. Can we ever know ourselves?