"Brox's magical axe was found after the battle, having not been lost with his death on the other side of the Well, and washed up on the shore of the new Kalimdor. When Krasus returned to the present day, his first act was to take the axe directly to Thrall. Disguised as an orc shaman, Krasus told his tale of how Brox helped stop another demon invasion, and implored the Warchief to sing songs of Broxigar the Red, his legendary life, and his glorious sacrifice." from wowpedia and also from the novels WotA.
To be honest it would make a big difference such as how Fel'o'melorn (Flame strike) Kael'thas sword parried Frostmourne after it got stronger when reforged.