What happens if a magic item gets broken? Do they lose their magic power? Do they regain magic power when get repaired?
What about Mending? The spell specifically says it does not restore magic, but can it restore the ability to use Mended magic item?
The easiest example is a wand. For example, a wand is broken into two. Can the top half be used to cast the spell? If not, can it be used to cast the spell after it is Mended? Or do the characters need to bring it to a "magic shop" to get it repaired?
I'm asking about magic items in general, which can be repaired using Mending. For this question I'm particularly interested in wands and weapons, but will appreciate a more general guidance on treating broken magic items.