Martin's Sword

[UNKN0WN]

you mean a "comet" when you say "metal from a falling star" right?

[AxeHound]

Or a meteorite.

[Buckler The Leg Buckler]

or even a piece of uranium!

[White One6193]

or even a piece of uranium!

Waht're ya thinkin?!Uranium is deadly!

[321tumbler]

I don't think it is a magic sword because in a few books people say that the people who wield it give t its "magic" not the sword.

[surfdude]

Also it is said Martin's sword was made using bits of a meteorite which is partly responsible for the power of the sword. I think it is a fantastic.

[Tiria Wildlough Rhulain]

Oh yeah, I think Martin's spirit makes the sword so strong. I also think it really depends upon who wields it. I really like how each generation has a different warrior to wield the sword. My favorite to wield the sword so far is either Dannflor or Trisscar.

[Ungatt Trunn]

Im my opinion, Martin's spirit has nothing to do with it being so strong. I think Martin's spirit is who puts his Sword in the right hands. It is said in several Redwall books that Martin's Sword was so strong was because it was made from a falling star.

[Free Thought]

There are many different kinds of strength. 
Yes, the comet/fallen star/meteor is what made the sword physically strong (as Boar mentions in the book), but also the sword gives a certain strength to its wielder.  This is a more psychological kind.  I don't think its Martin's spirit per se, but rather a new found confidence in the beast holding the handle.  Kinda like if you were given Michael Jordon's basketball shoes and told to go shoot some hoops.  You'd feel a little more empowered to have something of a 'great one.'  I think Martin's spirit inspired bravery and action, but when it all boils down to it, strength and courage are found within.