Okay, um...

Artifacts are supernatural items from myth. They typically have fallen out of use and weakened as a result. They are therefore converted into Divine Gear. These are really rare.

Divine Gear with mythological basis draw on that myth for power, but aren't the true thing. They're easier to obtain but won't have some of the more extreme abilities of the original item.

Regular Divine Gear are the most flexible since they can be anything, but they don't have any mythology power boost, so they need to be made very well in order to be as strong.