Por que a Irmandade não lançou o Um Anel em outro vulcão? [duplicado]

Você está enganado. Nenhum qualquer vulcão serviria, nem o dragão-dragão poderia destruir o Um Anel. O Monte da Perdição teve um significado mágico, já que o Anel foi forjado lá.

‘Your small fire, of course would not melt even ordinary gold. This Ring has already passed through it unscathed, and even unheated. But there is no smith's forge in this Shire that could change it at all. Not even the anvils and furnaces of the Dwarves could do that. It has been said that dragon-fire could melt and consume the Rings of Power, but there is not now any dragon left on earth in which the old fire is hot enough; nor was there ever any dragon, not even Ancalagon the Black, who could have harmed the One Ring, the Ruling Ring, for that was made by Sauron himself.

There is only one way: to find the Cracks of Doom in the depths of Orodruin, the Fire-mountain, and cast the Ring in there, if you really wish to destroy it, to put it beyond the grasp of the Enemy for ever.’

SdA, sombras do passado

Eu também contestaria a idéia de que os Anões já mergulharam em magma. Não há indicação de que eu saiba que eles fizeram isso. Gandalf caiu em Moria, que era o maior e mais antigo mergulho dos Anões, e Gandalf caiu mais do que os Anões haviam cavado, e ele não o denunciou.

‘Name him not! ’ said Gandalf, and for a moment it seemed that a cloud of pain passed over his face, and he sat silent, looking old as death. ‘Long time I fell,’ he said at last, slowly, as if thinking back with difficulty. ‘Long I fell, and he fell with me. His fire was about me. I was burned. Then we plunged into the deep water and all was dark. Cold it was as the tide of death: almost it froze my heart.’

‘Deep is the abyss that is spanned by Durin's Bridge, and none has measured it,’ said Gimli.

‘Yet it has a bottom, beyond light and knowledge,’ said Gandalf. ‘Thither I came at last, to the uttermost foundations of stone. He was with me still. His fire was quenched, but now he was a thing of slime, stronger than a strangling snake.

‘We fought far under the living earth, where time is not counted. Ever he clutched me, and ever I hewed him, till at last he fled into dark tunnels. They were not made by Durin's folk, Gimli son of Gloin. Far, far below the deepest delving of the Dwarves, the world is gnawed by nameless things. Even Sauron knows them not. They are older than he. (LotR, The White Rider)

Além disso, não há outros vulcões conhecidos na Terra Média; eles teriam que descobri-los. Quaisquer que fossem os vulcões, eram quase certamente no sul e no leste, reinos também governados por Sauron.

A razão pela qual eles tiveram que levar o anel de volta para o Monte Doom é porque foi onde ele foi forjado. Mount Doom era um vulcão bastante singular; Sauron especificamente escolheu trop ocupar Mordor porque Orodruin (o nome élfico do vulcão) estava lá.

Ele esculpiu uma oficina, Sammath Naur, que alimentou diretamente a lava dentro da montanha, e usou isso para fazer sua elaboração. A implicação é que essa montanha era, em certo sentido, o mais poderoso vulcão da Terra Média.

Porque é onde o anel foi forjado, esse era o único lugar poderoso o suficiente para destruí-lo. Somos levados a supor que largá-lo em qualquer outro vulcão teria deixado apenas flutuando na lava, presumivelmente para ser expelido de volta à superfície na próxima erupção.

Não era um vulcão comum

When Sauron began searching Middle-earth during the Second Age for a permanent dwelling place, his attention was immediately drawn to Mordor, and especially to Orodruin, whose power he believed he could use to his advantage. He subsequently established his kingdom based around Orodruin and "used the fire that welled there from the heart of the earth in his sorceries and his forging". The most famous of Sauron's creations forged at Mount Doom is the One Ring. In The Fellowship of the Ring, Gandalf explains that the materials of which the Ring is made are so durable and the enchantments with which it is imbued so powerful that it can only be destroyed in the Cracks of Doom where it was made.

Orodruin is more than just an ordinary volcano; it responds to Sauron's commands and his presence¹, lapsing into dormancy when he is away from Mordor and becoming active again when he returns. When Sauron is defeated at the end of the Third Age, the volcano erupts violently.

¹ Fonte

Isto é uma evidência implícita de duas observações

Sauron extended his own power into it, and was able to control its fires. It seems to have lain dormant when Sauron was away from Mordor, and sprung into life when his power grew. After the Downfall of Númenor, for example, the Exiles in Middle-earth first knew that Sauron had also escaped the Downfall when they saw smoke rising from Orodruin, and an Age later at the Council of Elrond (The Lord of the Rings II 2), Boromir says 'The Nameless Enemy has arisen again. Smoke rises once more from Orodruin that we call Mount Doom'.

Estes dois inferem que quando as pessoas viram a atividade do vulcão, isto implicou que o Lorde das Trevas estava fazendo as maquinações na Montanha do Fogo. A sugestão é que, de alguma forma, suas poderosas magias estavam ativando o vulcão, ou seja, fazendo com que ele respondesse.

Observação lateral:

It isn't clear how Elrond or Círdan could know that throwing the Ring into Orodruin would destroy it - neither of them had had any part in the making of the Rings of Power, and both had refused Sauron's lore when he offered it to them. At this time, though, both Elrond and Círdan were themselves Ring-bearers (of the Elven-rings Vilya and Narya), and perhaps these Rings gave them special insight².

² Fonte

Elrond diz no Conselho que não há mais dragões cujos fogos sejam quentes o suficiente para afetar os Anéis de Poder, e que nem mesmo Ancalagon, o Negro, poderia ter ferido o Um Anel.

Viagens de longa distância com o Anel teriam sido arriscadas. Quanto aos anões lançando-o na lava, não foi um vulcão que teria prejudicado o Anel, mas sim os Incêndios onde ele foi forjado. Provavelmente apenas encerrando-a na lava seria equivalente a simplesmente escondê-la no subsolo, e Gandalf diz que coisas desconhecidas moram profundamente no subsolo:

Something has crept, or has been driven out of dark waters under the mountains. There are older and fouler things than Orcs in the deep places of the world.

( Senhor dos Anéis , Livro II, Capítulo 4, "Uma Viagem no Escuro")

Far, far below the deepest delving of the Dwarves, the world is gnawed by nameless things. Even Sauron knows them not. They are older than he. Now I have walked there, but I will bring no report to darken the light of day.

( Senhor dos Anéis , Livro III, Capítulo 5, "O Cavaleiro Branco")

Esta é a mesma razão pela qual simplesmente jogá-lo no mar não era uma opção.