sentences:  The darklings and slithers are ancient creatures that were once the dominant species on the planet.Darklings come in many shapes and forms, and have the power to change their physical form at will, whereas slithers are generally serpentine in nature.As humans began to grow in intelligence they hunted the darklings and slithers by exploiting their weakness to new concepts, such as mathematics and language (particularly the number "13" and words with 13 letters), light and heat, and new "technology".