The world is old, there are many gods and many sources of divine magic interacting in strange ways and mixing and accumulating and dispersing throughout the world. Artificers are especially attuned to all these magical artifacts and accumulations of magic. By exploiting their insight into where and how to squeeze out different forms of accumulated divine magic, they can even enchant or bless or brew different magical items of their own! Most artificers are attuned enough with accumulated magic that they can usually tell when an item is magical by touch.