Essence

Essence is an energy generated by dreams, wishes and memories, which cannot be used by any normal being, but only godly beings.

Nature
Essence is generated from the dreams of creatures, which occur in the Dream Realm, allowing for their harvest by the beings populating the realm. It is also generated by wishes, when creatures have things they strongly want or wish to have or happen, this generates Essence. Finally, it is also generated by strong memories, leftovers from the past with great importance.

Essence has various uses, however only for godly beings. It can be consumed, making the creature stronger and more powerful within the dream realm. It can also be manifested as various things, such as physical objects like swords. In its natural state, Essence manifests itself as a light, visible only to the creatures of the Dream Realm.

Nightmare Flame
Nightmare Flames are a form of Essence, identical in almost every way, except its origin. While Essence is derived from dreams, wishes and memories, Flames are generated by nightmares, fears and also memories. They can also only be harvested by the creatures of the Nightmare Realm, and manifests itself naturally as a red flame.