system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Where are all the dragon's besides smaug? What do we know about there powers?

I have read anything outside of the 3 books and the hobbit and not for a very long time. So where are all the dragon's? And what could they do (power wise) and where did/do they come from?
gpt
Many of them simply died out over time. They were bred by Morgoth for the War of Wrath.

The largest and most powerful dragon of all was Ancalagon the Black (Briefly mentioned by Gandalf in LOTR), his death at the hands of Eärendil and the eagles (Specifically his bulk hitting the ground) destroyed Thangorodrim (The tallest mountains in Middle Earth) and reduced them to rubble.

Dragons are very smart, very deadly, can hypnotize you with their gaze, and the greatest of them had fire that could melt Sauron's rings (But NOT the One Ring), which is what happened to a few of the Dwarven rings.