I have this, and i heard it said that the more battles you win the stronger it gets, and if you run away it goes down.......however no matter how many battles i win, it stays the same, but if i run away from 1 battle it goes down.
how do i make it go up?

i think it has to do with what you did BEFORE you got the sword.

I COULD CERTAINLY BE WRONG, THO, AS I OFTEN AM.