Tome of Visions

 is a weapon in SINoALICE.

Weapon Story
The only way to realize dreams in this insane world was through sleep. No wish was unattainable within a sweet, sweet dream.

Knowing that, it's plain to see why a tome that could control dreams would be so sought after.

Upon finally obtaining it, a mage set out to reprint the tome so that everyone in the world could attain true happiness.

If we are to point out the difference

between dying and continuing to sleep,

it's whether or not it can be interrupted.

Before long, the mage's wish was granted, and reprints of the tome were distributed across the land.

Both the sane and the mad migrated to the world of dreams, and so it too became a world of insanity.

In the end, the only one spared this tragedy was the dead mage himself.