[Legolas]

But Thingol perceived their hearts, and saw well that desiring the Silmaril they sought but a pretext and fair cloak for their true intent; and in his wrath and pride he gave no heed to his peril, but spoke to them in scorn, saying: 'How do ye of uncouth race dare to demand aught of me, Elu Thingol, Lord of Beleriand, whose life began by the waters of Cuiviénen years uncounted ere the fathers of the stunted people awoke?' And standing tall and proud among them he bade them with shameful words be gone unrequited out of Doriath.

Then the lust of the Dwarves was kindled to rage by the words of the King; and they rose up about him, and laid hands on him, and slew him as he stood. So died in the deep places of Menegroth Elwë Singollo, King of Doriath, who alone of all the Children of Ilúvatar was joined with one of the Ainur; and he who, alone of the Forsaken Elves, had seen the light of the Trees of Valinor, with his last sight gazed upon the Silmaril.

[...]

Upon Doriath a heavy change had fallen. Melian sat long in silence beside Thingol the King, and her thought passed back into the starlit years and to their first meeting among the nightingales of Nan Elmoth in ages past; and she knew that her parting from Thingol was the forerunner of a greater parting, and that the doom of Doriath was drawing nigh. For Melian was of the divine race of the Valar, and she was a Maia of great power and wisdom; but for love of Elwë Singollo she took upon herself the form of the Elder Children of Ilúvatar, and in that union she became bound by the chain and trammels of the flesh of Arda. In that form she bore to him Lúthien Tinúviel; and in that form she gained a power over the substance of Arda, and by the Girdle of Melian was Doriath defended through long ages from the evils without. But now Thingol lay dead, and his spirit had passed to the halls of Mandos; and with his death a change came also upon Melian. Thus it came to pass that her power was withdrawn in that time from the forests of Neldoreth and Region, and Esgalduin the enchanted river spoke with a different voice, and Doriath lay open to its enemies.

Thereafter Melian spoke to none save to Mablung only, bidding him take heed to the Silmaril, and to send word speedily to Beren and Lúthien in Ossiriand; and she vanished out of Middle-earth, and passed to the land of the Valar beyond the western sea, to muse upon her sorrows in the gardens of Lórien, whence she came, and this tale speaks of her no more

Thus it was that the host of the Naugrim crossing over Aros passed unhindered into the woods of Doriath; and none withstood them, for they were many and fierce, and the captains of the Grey-elves were cast into doubt and despair, and went hither and thither purposeless. But the Dwarves held on their way, and passed over the great bridge, and entered into Menegroth; and there befell a thing most grievous among the sorrowful deeds of the Elder Days. For there was battle in the Thousand Caves, and many Elves and Dwarves were slain; and it has not been forgotten. But the Dwarves were victorious, and the halls of Thingol were ransacked and plundered. There fell Mablung of the Heavy Hand before the doors of the treasury wherein lay the Nauglamír; and the Silmaril was taken.