This build can actually be pretty achievable one thing I suggest you do first is complete ACT 1 of the story until you can explore the entire map than just collect a few artefacts from all the domains such as berserker and martial artist.
Once you have done those things just play around with your artefacts and your rare weapons as they can be pretty GOOD and sometimes better than legendary weapons at times due to how easy they are to upgrade.
Characters can be level 20 and still be able to take on these challenges so long as you know how to dodge and switch characters for burst to avoid damage.
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