Probably black; I'm pretty sure that's his dragon's color, but it might be different because he has had two dragons. Probably, it will be revealed in the fourth book. I believe it's brown, the color of his first dragon.
The sword is Brisingr forged by Rhunon through Eragon. *It lights up in flames when Eragon says its name.
Well Murtagh thinks Eragon is his little brother.Murtagh is the son of Morzan and so gets his sword. Eragon gets a new sword in the 3rd book.
Brom said the line "May your sword stay sharp" in the book Eragon.
yes
It is a rider named Arva's sword.
Morzan, the rider, had the sword Zar'rok formed from the elven master forger, and was given to Morzan just before he betrayed the riders. Then, when Brom killed him, he stole his sword which was supposed to be given to Murtagh, but then gave it to Eragon because he knew that he has more supposed to have it than Brom.
I believe that it was Falchion.
yellow :)
Eragon finds bright steel (the strongest metal on earth )under the roots of the meona tree wich he gets an elf to make the riders sword brisingr out of ( a magical fire blade that only works for eragon). and really i guess it's with him if that's sorta more wat u ment
undbitr, it is broms sword, however galbatorix wields it
Ergon is talented because he is great with his sword and his magic skills are really good.
A red sword. It belonged to Morzan, Eragon's stepfather, and was won in a fight by Brom. Both Brom and Morzan are Dragon Riders. In the ancient language, it means "misery".