The Fëanturi, masters of spirits, are brethren, and they are called most often Mandos and Lórien. Yet these are rightly the names of the places of their dwelling, and their true names are Námo and Irmo.

Námo the elder dwells in Mandos, which is westward in Valinor. He is the keeper of the Houses of the Dead, and the summoner of the spirits of the slain. He forgets nothing; and he knows all things that shall be, save only those that lie still in the freedom of Ilúvatar. He is the Doomsman of the Valar; but he pronounces his dooms and his judgements only at the bidding of Manwë. Vairë the Weaver is his spouse, who weaves all things that have ever been in Time into her storied webs, and the halls of Mandos that ever widen as the ages pass are clothed with them.

Irmo the younger is the master of visions and dreams. In Lórien are his gardens in the land of the Valar, and they are the fairest of all places in the world, filled with many spirits. Estë the gentle, healer of hurts and of weariness, is his spouse. Grey is her raiment; and rest is her gift. She walks not by day, but sleeps upon an island in the tree-shadowed lake of Lórellin. From the fountains of Irmo and Estë all those who dwell in Valinor draw refreshment; and often the Valar come themselves to Lórien and there find repose and easing of the burden of Arda.

Mightier than Estë is Nienna, sister of the Fëanturi; she dwells alone. She is acquainted with grief, and mourns for every wound that Arda has suffered in the marring of Melkor. So great was her sorrow, as the Music unfolded, that her song turned to lamentation long before its end, and the sound of mourning was woven into the themes of the World before it began. But she does not weep for herself; and those who hearken to her learn pity, and endurance in hope. Her halls are west of West, upon the borders of the world; and she comes seldom to the city of Valimar where all is glad. She goes rather to the halls of Mandos, which are near to her own; and all those who wait in Mandos cry to her, for she brings strength to the spirit and turns sorrow to wisdom. The windows of her house look outward from the walls of the world.