Item durability...

[LordRahl86]

DoN cultural charms have set bonuses. For example, a High Elf Cleric equipping all their cultural armor will get the maximum bonus. As the Cleric replaces pieces, the power of the charm fades.

Personally, I'm not a big fan of set bonuses, at least as they generally exist. They seem to emphasize form over function.

Actually, evolving items would be superior. I can see the logic in making armor gain bonuses before losing them (for example, shoes start to get more comfortable before they're worn down, the same goes for clothes... and for armor).

But that's only for hyper-realism, and can easily be added in after evolving items are implemented.