However, they were ambushed by enemies, including a Balrog. Glorfindel fought the Balrog and succeeded in slaying the monster, but was himself mortally wounded. His body was recovered by the great eagle Thorondor and buried under a stone cairn, where afterward grew yellow flowers.
The Balrogs were Maiar corrupted by Morgoth during the creation of Arda, who cloaked themselves in shadow and flame and carried whips and swords. Famed Balrogs include Gothmog, slain by Ecthelion, and Durin's Bane, slain by Gandalf.
The Eagles came to help them, but Glorfindel fought the Balrog alone upon the pinnacle of a rock. Both died after falling in the abyss, and their duel is sung of by many songs.
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".
Throughout Tolkien's works, two characters, Gandalf and Glorfindel, faced off against a Balrog, and though they won, the battle cost them their lives. Though Galadriel herself never (as far as we know) went face to face with a Balrog, she would likely have met her match if she did.
Gandalf's main reason for supporting Thorin's quest in The Hobbit was to eliminate the threat of the dragon Smaug, who would be a powerful ally for Sauron. Despite popular belief, the Balrog known as Durin's Bane was more powerful than Smaug in Middle-earth, being a literal, primordial demon.
Secondly, Balrogs were the epitome of malice and power while Sauron only ever won one of three fights he ever had. Sauron was the great deceiver. His power lies in planning, subterfuge, manipulation, and corruption.
Without the One Ring, Sauron would not have had the ability to dominate a will as strong as a Balrog. As such, the Balrog acted just as he did in the story: in accordance with a "common evil" against "good".
Although both the Balrog and Smaug are creatures of fire, and Gandalf is able to match them thanks to the power of his fire ring, defeating the Balrog takes far more spiritual prowess, which is why Gandalf is able to essentially 'level up' and comes back as Gandalf the White, whereas defeating such an immense physical ...
Still, the dragons proved more effective in battle. Then there's Gandalf the Grey, who managed to kill a Balrog single-handed, but decided to manipulate some Dwarves and one very reluctant hobbit into dealing with Smaug.
Ecthelion stood no chance against the Lord of Balrogs, and lost his sword in the brief struggle. But then Ecthelion leaped forward, and stabbed Gothmog in the breast with the spike atop his helm. They both fell into the Fountain of the King, where Gothmog, if not already killed by the spike, drowned with his opponent.
For more than five millennia, the Balrog hibernated in his deep hiding place at the roots of the mountains in Khazad-dûm. He remained undisturbed throughout the Second Age and most of the Third, before the mithril-miners of dwarf-King Durin VI awoke him in T.A. 1980.
So, when Gandalf agreed with Frodo's decision to travel through Moria, he knew that something could be hiding there. Yet, he had no reason to think that it would be something as awful and powerful as a Balrog. Only King Dain Ironfoot knew that Durin's Bane was a Balrog.
Glorfindel fought the Balrog and succeeded in slaying the monster, but was himself mortally wounded. His body was recovered by the great eagle Thorondor and buried under a stone cairn, where afterward grew yellow flowers.
The Balrogs, or Valaraukar (singular Valarauko, Quenya for "Demon of power"), were three to seven Maiar seduced and corrupted by Morgoth into his service, turning into dreadful Úmaiar and scourges of fire cloaked in shadow.
Gothmog, one of the first Balrogs to become Morgoth's allies in the First Age, is regarded as the most powerful Balrog in Middle-earth. As the High Captain of Angband, he is given the title 'Lord of Balrogs'. Although he carries a fiery whip to battle just like the rest, he is also renowned for having a large black ax.
It's worth noting that Sauron wasn't a Balrog. His appearance was dark and wreathed in fire, but he wasn't physically the same as a Balrog. On a surface level, it's a bit of a plot hole. After all, Sauron and the Balrogs were both Maiar, and they both served Morgoth's evils during the First Age.
The Balrogs are essentially demonic equivalents to the wizards. It is hard to fathom the exceptional might of these creatures. With every subsequent age in Tolkein's Middle-earth, the magic in the world diminished, becoming less great in scale.
Of course, Gandalf had already fallen prey to the Balrog of Morgoth during the events of The Fellowship of the Ring. Yet, this fight was surprisingly an even match, since the Balrog was once an angelic being as well, meaning that their level of power came close to that of a wizard.
There is no account of any dwarf ever killing a Balrog, let alone multiple. The only recorded instances of Balrogs having been slain are Gandalf's slay of Durin's Bane, Echtelion's slay of Gothmog and Glorfindel's slay of an unnamed Balrog.
As a Valar, Morgoth led a whole slew of Balrogs in the First Age, but because Sauron was only a Maia, the Balrog would have had no loyalty to him. He was his own master in Moria, and no Dark Lord was going to ruin that.
Smaug is able to detect Bilbo through the Ring's invisibility, but the hobbit does not even need the Ring to survive the meeting with the dragon, relying on his wits to flatter the dragon and eventually escape.
If the Balrogs are corrupted Maiar, then would Saruman eventually become one? Saruman wouldn't become a Balrog, because his nature is inherently different and he's kind of stuck in the body he's in.
No, Balrogs do not serve Sauron. Similar to Sauron, Balrogs are Maiar, powerful spiritual beings second only to the Valar themselves. They were corrupted by Melkor's evil before the first age and were made into Valaraukar (Demons of Power). They very strength and wills were bound to Melkor.
Morgoth, the first to reign terror upon Middle-earth, was more powerful than Sauron and commanded an army of dragons and Balrogs. While both Morgoth and Sauron were cunning, Morgoth's rule and terror lasted longer and his corruption spread further, making him more formidable in the Lord of the Rings universe.
