system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why was Sauron harmed by conventional weapons, when other less powerful creatures aren't?

During the fight against the Balrog Gandalf states that swords would be of "no use" against it.

Later Gandalf, (after becoming "the White") claims that the fellowship has no weapons that can harm him including Aragorn who wields Andúril.

Why was Ellendil able to harm Sauron with Narsil if less powerful Ainur are unaffected by the same weapon?  (Sauron was wearing the one ring too!)
gpt
It's not that they are immune to conventional weapons, Gothmog the leader of the Balrogs were implied by a pointy helmet after all, its just that they are damn hard to kill due to being alive for 40 000 years and no one in their company was skilled enough to kill a Balrog or gandalf. Simple as that. Wasn't a matter of durability or kryptonite weapons, just skill.

Sauron was a rather pisspoor physical fighter (atleast compared to his power level as the most powerful maiar) and he faced the most skilled and powerful melee fighters of the second age.