Battle of the Sapphire Spears

Potimia is a place that the natives are weary of the dreams and nightmares that live among them. But it wasn't always so. Historically they were only ever present when one was a sleep. This changed after the Battle of the Sapphire Spears.
In the Realm of Sand where the dreams and nightmares dwell upon the mystical dunes waiting for those that sleep. A truce was held. The dreams would allow the nightmares to feed and swoop in to comfort. A cycle that suited for a while. 
The nightmares grew tired of being the ones people shunned, the ones the dreams shooed away. In the shadows of the dunes they plotted. Grew their forces, an army of nightmares wielding thousands of sapphire tipped spears. A gemstone deadly to those of the Realm of Sand.
When it was time to strike they hit hard at the Dreams, slaying them in the hundreds. They had not been prepared. But some of dreams were those of mighty warriors and leaders. They ran and gathered a small force. They too took up the spears, edging the tips with sapphire. 
Upon the dunes at the Oasis of Waking, a portal to the material realm of Potimia the dreams stood ready. Far smaller in number than the nightmares they hid among the leaves and waters of the massive oasis. 
When the nightmares entered the oasis, the dreams attacked, ambushing and retreating back into hiding. Fear was overwhelming here and many in the material realm died of it. All consuming fear leaking through the gateway. 
The tactics of the dreams was enough to cause the nightmares to second guess going through the gateway. The sapphire bit and burnt. Back to the shadows among the dunes they went. To plot for another sleeping.
What they didn't know is only two dreams were left, Hope and Safety. The Oasis of Waking is still soaked with the blood of dreams and nightmares, but it has two guardians waiting for the next time.