A treatise on the existence of beings that live and act within the shadows

"A treatise on the existence of beings that live and act within the shadows, by Amfolin D. F. Y. Porinsipa, Scribe and Bard to his lord Hiliana, in this Six Hundred and Seventh year of the Third Common Age, on this land of Lianalith, shining kingdom of Elves on this land of Theadritch. Translated by Amlil XVII, 1079. ((Yes, I'm bringing that in.))
Of the existence of spirits there can be no doubt, and to their nature many scrolls and tomes are devoted. Spirits and those creatures of elevated or infernal planes, demons or scions be they, are pervasive throughout this world, but none have I seen strike such fear as that on this land which is composed of shadow and thunder. As I did wander as I was wont to do in my youthful days I chanced upon a glen in a faraway land, beyond those mountains where the dwarfkind do make their homes. In this forest did I take my rest, and break my bread, but as I tore branches from the trees to build my fire I was acosted. Cloaked in deepest shadow and speaking in monstrous tones that did shake me to my core, this spirit spoke to me. I was quite sure it was a demon, infernal being the of the UnderPlanes, but it made no move to harm me as I cowered from it. Instead I was treated with curious regard, and to my dismay the creature came closer. For an instant did the shadows part and I saw its deathly eyes, burning red set into grey, and I did stand and strike a pose defiant. 'Spirit, if you be one,' said I, bolstered by I know not what, 'If you seek to harm me, do not so! For I am an emissary of the Greatest King Hiliana, sent to make peace with these lands, and to harm me would be to bring down the whole of the armies of Lianalith, a million archers strong, upon your head!' This was, of course, a falsehood, but my bluff seemed to have effect. The being spoke, rattling my bones, and said unto me in perfect speech, 'I have no need of your elder king, but to the young race leave this land, for they will be mine in the end. As to your armies, know but this: No weapon made by that which dies will fell me.' With that he bade me leave his land and to this day I've ne'er returned."