Uh....why? It's just a sword dude, and the animalpeople zombies aren't that strong.
SURELY the mysterious glowing forcefield over the descending stairwell carved out of undestructible rock is a major clue about the nature of the curiously placed instrument... and if that wasn't enough, perhaps the interesting description pages you make mention of might give further insight into the nature of said implement, and why it was so curiously installed in such a curious underground structure to begin with, no?
It seems kinda prudent to make a substitute for said forcefield, if by some cosmic joke, the removal of said artifact would in some fashion break said seal, and release some ancient and unspeakable horror, don't you think?
Setting up a means to descend that stair at your leisure, after careful preparation, seems much more reasonable than just grabbing shiny things willy nilly, or rushing in where angels fear to tread, does it not?
Which is more amusing? Dunderheadedly throwing the self destruct lever trying to open the drawbridge, or noting that your predecessor had installed such a feature, and clandestinely sabotaging his wicked scheme, causing it to backfire for him when he tries to pull it himself?
Personally, I prefer to roll with the latter, if only to see Mr Big and Scary get egg on his face before he feeds me to his pet eldritch horror.
Who knows! My attemps at sabotage might result in epic unfortunate consequences! Hilarity could ensue! Why deny yourself the experience?