I noticed that I'm collecting artifacts by defeating the dragons on every 10th level. I get that this is some kind of goal for the game (collect 5 artifacts in a single playthrough). The collected artifacts seem to persist in my character select screen and across playthroughs for that class.
As the swordsman, I have a starting artifact (some kind of banner, what does this do?) and four empty slots. There's also a
Reset button. I'm assuming that's to reset my collected artifacts.
That leads me to think that there's more than 5 unique artifacts and that there might be some reason to collect different sets of artifacts? Is that so?