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[Undertaker]

Did you knew about 'undead mode'? It works like this:

Make sure all but one of your party members are dead. Now, when the last character receives a mortal blow, quickly press escape and save your game (in an empty slot, of course). Now reload the game. All your characters will still be dead, but the game continues like normal (ie. creatures try to attack you). You can still hurt the creatures by throwing rocks/weapons/armor. You can go back to normal mode by reviving one of your characters with an item.

This trick can easily be done by attacking on of the Gladstone guards; since they hit you so hard, it takes a while for your health meter to reach 0. This way you have more time to press escape.
After you kill the Gladstone guards, you have four nice Halberds!