And there lies the problem. If you give a player an indestructible weapon you'll soon find them using it to prop up collapsing wall traps and 101 other kinds of cheese you hadn't intended.
The law of cool and the law of unintended consequences crash into themselves at times like this!
The advantage of the way that it has been written is that it isn't leaving open loopholes like this ( although scribbles last suggestion is a flavourful one)
Cheers
It's at those times when the Law of Cool and the Law of Unintended Consequences collide, that I invoke the Law of Wrath from Above. Misuse the boon of a great power and it gets taken away, until you've learnt your lesson. You don't want to tee off Stormbringer, Eater of Souls.
True. What will your devil/fey noble/far-realm outsider think of you using their gift to you as a mere tool?