[quote=@IncredibleBee]
<Snipped quote by Lost Cause>

If it didn't, wouldn't literally every magical character be useless outside their home dimension?
[/quote]

It's the other way around: it stops effects that exploit specific weaknesses in a setting from applying universally, without unduly affecting the people using the magic. Being able to cut through anything and everything remotely magical because of a quirk in the definition of an enchanted item in Berserk is horrendously powerful--especially when it comes to destroying items that are literally irreplaceable.

Plus we still have no idea what the deal with the hammer actually is, other than 'is hammer, magic is involved'.