A bunch of my HC for Langon
I may add some more and edit this one when I can write better or get some idea or feel to revise my words or something?
well I have a HC of Langon : since he is the herald of Melkor, he would be the last survivor of Melkor's party. I think he would be left alone in the middle earth even after the final ship made by Cirdan departed to Valinor. He can not be forgiven since he was literally the 'voice' of Melkor. The one who spreaded the dark one's will.
Then why would he not help Mairon in second and third age? : Think of all their failure and what their lord had become. The advocate himself may not have will to do nothing at all after all those things. Mairon may go through his own path but that does not mean Langon must follow his suit. The weary herald may just wander around everywhere, he can go anywhere except where Mairon dwells. If he meet him again, the other one would persuade him to join him and bring their lord back to endor. Driven by love and memory, Langon would join the ruinous, weary path filled with bloodshed again. So I think he chose to keep himself away from his own past and former friend.
But I would like to think that after all those years, when Mairon fails to get his ring back and finally perishes he would have feel somewhat sappy. Mairon can finally be with the one he loved and Melkor will not be alone anymore. Melkor never knew how to have a 'normal' relationships with people, especially with his lover due to his own damn sense of dealing with his emotions and yes, their story of life. (My HC of him is stereotypical INTP with some pinch of ENTP by the consequence) He may learn some of it and get their own way to make it better through their time. There is no one to meddle them in the void.
(My headcanon of them is : possessive Mairon×Melkor with dismissive-avoidant attachment-Yes Melkor LOVES Mairon but does not know how to give love to him in the way Mairon feels 'accurate' so he tries to run away from Mairon, Mairon does love Melkor so he gets more possessive as the time goes on.-I think if Mairon was better in 'love' he would not have such a doomed life after the war of wrath. Yes, I am talking about 'the one ring'.- But since both Melkor and Mairon is fucked up people with their own piles of issues it is not likely to happen at all. They have to deal with bunch of other things for eternity after all.)
And then, Langon would really be alone. He has no vala to serve, but power of Melkor is really omnipresent in Endor. He may live on but he has no friends nor enemies. Lonely as hell. So he may try to open the doors of the night by himself after all those tons of years. Spreading Melkor’s will to the human since all people of his ages are all gone. Lonesome servant who failed everything : his duty, his will to protect, his will to support his people - finally acts and succeeds in opening the door. I would like to think the one thing Langon had to do to make Melkor and Mairon free was to give himself up. The world-weary maia may do it so easilly just like turning off the candlelight with is fingertips. So Dagor-Dagorath will start with Langon’s death : if the voice dies, the will dies. Nobody can understand someones will without communication. The ‘voice’ can mean ‘the communication’ too. The power who cannot carry out their will can’t exist. Yes, I think that is the ‘death’ of Melkor too.