"Dimensional Rifts from the Abyssal Realm."
She completed as Nolan's eyes narrowed.
"According to thousands of years of information that we Celestial Heirs have gathered, the Nightmare creatures do not belong to this plane of existence.
They belong to another realm, commonly referred to as the Abyssal Realms.
"To come to our plane of existence, they use a means of transport which we all refer to as Rifts."
"The Nightmare creatures are capable of reasoning."
"They knew that if they opened up a rift to come to our plane and chose to come through the Celestial Realm, they would be swiftly killed by the powerful Celestial Heirs."
"So, therefore, they choose an area where the people are much weaker. And the best place is the mortal realm."
"The mortals, being naturally weak, are nothing but prey to the Nightmare creatures."