A Prophecy Forgotten

You do not know us. You cannot see us. We are your guards, your protectors. For the past 3000 years, we have fought a war that stretches from our world to yours. Our prophecies tell us this war will end, but we are weary. Our hope is dwindling. Our faith is nearly lost. Their war has raged for centuries, a war in which hundreds of thousands have died. Their ancient writings command them to guard and protect man, and to fulfill that order they have spilt their blood across Earth and the dimension beyond. Yet victory still eludes them, and their dedication to their task is waning. Their will to fight has diminished. They have become complacent-ripe for conquest by an enemy they least suspect. And now is when Earth needs them most.