She had no role in the major wars of the First Age, believing that defeating Morgoth was beyond the power of the Eldar; when Morgoth was defeated by the coming of the Valar out of the West she, having played no part in the earlier Kinslaying, was offered safe return to Valinor.
He will fight in the Last Battle against the Valar and their allies, but will ultimately be slain by Túrin Turambar, the Man he cursed. By finally defeating Morgoth, Túrin will avenge not only himself, but all members of the race of Men.
The War of Wrath, also called the Great Battle, was a clash of Elves, Men, and Valar against Morgoth marking both the end of the First Age and of Morgoth's rule in Middle-earth. It was the largest battle to ever occur in Arda.
Most characters in The Lord of the Rings got to work rebuilding what was lost, but Galadriel decided to rest. She had begun her war against Sauron halfway through the Second Age, meaning that by the time Sauron was defeated, she had been in the fight for over 3000 years.
According to Tolkien's writing, Galadriel didn't fight in the War of Wrath because she didn't believe Morgoth could be defeated without the help of the Valar.
What HAPPENED to MORGOTH during the DOWNFALL in the War of Wrath?
Can Galadriel defeat Morgoth?
Morgoth would win. Galadriel has a lot of spiritual energy. Her spiritual energy was explosive enough to collapse Dol Guldur, without draining her at all. This is Maia level spiritual energy, similar to that of Feanor.
Fingolfin, receiving false news, rode alone to Angband and challenged Morgoth to single combat. He wounded Morgoth several times, but grew weary and was killed by the immortal Vala. Fingolfin has inspired artists, musicians and video game designers to create depictions of his deeds.
In his notes, Tolkien remarks that Sauron saw Galadriel as his equal. Add that to the fact that she's untrusting of Sauron (yes, even when he's in his Annatar guise) and an unwavering, single-minded force, and it's more likely than not that Sauron feared Galadriel — or the potential she held to upend his plans.
Additionally, while he was in his weakened state, Galadriel could hold him off through the power of will alone. However, if Sauron had his One Ring and faced off in a battle against Galadriel, it's unlikely that there would be much she could do.
Despite her power, Galadriel couldn't match Sauron's ability to wield the One Ring, and it would have ultimately turned against her. Even if she managed to carry the ring, Galadriel's ambition and power-seeking nature would have eventually led to her corruption, making her unfit to deal with Sauron's weapon.
It was said that Morgoth hated and feared the House of Fingolfin most among the Houses of the sons of Finwë, especially Fingolfin's son Turgon, as it was prophesied that his doom would come from the House of Turgon.
Ultimately, the only being more powerful than Morgoth in his prime was Eru Ilúvatar. Only the combined effort of the Valar could stop Morgoth, and only after countless battles. Sauron might have bested his mentor under certain circumstances, but Morgoth is the greater Dark Lord by every metric.
Túrin will run his black sword Gurthang (Iron of Death) through Melkor's heart, thus avenging the Children of Húrin (Sindarin: Hîn Húrin) and all the fallen (In the end of The Hiding of Valinor Eönwë, and not Turin, kills Morgoth).
Melkor is the most powerful of the Valar but he turns to darkness and is renamed Morgoth, the primary antagonist of Arda. All evil in the world of Middle-earth ultimately stems from him. One of the Maiar of Aulë betrays his kind and becomes Morgoth's principal lieutenant and successor, Sauron.
Gandalf pursued the monster for eight days, until they climbed to the peak of Zirakzigil, where the Balrog was forced to turn and fight, its body erupting into new flame. Here they fought for two days and nights. In the end, the Balrog was defeated and cast down, breaking the mountainside where it fell "in ruin".
Though neither is someone you'd wish to annoy, Galadriel is generally considered more powerful than Elrond in Lord of the Rings. Not only is she older than her Rivendell counterpart, but Galadriel witnessed the light from Valinor's Two Trees, giving her a mystic quality.
Thus, Galadriel's dark form in Jackson's The Lord of the Rings personified what would have occurred had the Lady of Lothlorien given in to temptation and taken the One Ring for herself. She would have succumbed to evil because the Ring was indomitable, even with her power.
Saving Galadriel at sea was likely a method of gaining her trust, since Sauron would need an Elf's friendship to enter their realm. Whether he targeted Galadriel specifically because he could exploit her bloody-minded rage and broken heart is unclear.
Sauron seemed to genuinely feel a connection to her, and part of that came from sensing the darkness inside of Galadriel. In that regard, his offer was really a seduction to the dark side.
Bloodlines are very important in Tolkien's stories, and it makes a lot of sense that Sauron would fear the great-grandson of the man who cut off his hand. Aragorn carried the blood of Numenor with him. His genetic connection to the heroes of the Second Age established him as a dangerous opponent of Sauron.
Galadriel is hot-headed, vengeful, arrogant, stubborn, and manipulative. She's quick to anger when confronted. Desires vengeance for the death of her brother.
Ëonwë herald of Manwë, one of the Lords of the Maiar and most likely the most powerful non-Vala being in Arda. For those who have read the Silmarillion, it seems that it were the Valar who defeated Morgoth.
However, near the end, Morgoth had dispersed so much of his own power into the world, that (Tolkien wrote in a private letter) he was actually weaker than Sauron. Sauron made torture a specialty. Morgoth tortured people too, but Sauron was really into it.
It was said that Morgoth hated and feared the House of Fingolfin the most of the three Houses of the sons of Finwe, and he feared most Fingolfin's son Turgon, as it was prophesised that from the House of Turgon would his doom come.
