I remembering reading somewhere after killing the evil loard cet, Kerah would give me her sword if certain option was chosen about giveing up the mavin sword. Anyone has any idea how to obtain her sword?? But she just walked away after the game..... ;(

Check you character's inventory. One of them should have the sword. If your inventory was too full, chances were it was dropped in the pyramid (in which case it's now unretrievable). You can reload and fight through the ending again, making sure you have an open space for the sword...that's all I can think of that would have happened.

-Sazerac