How would you do Darkin in DnD 5e?

So, I've been running a campaign based on Runeterra for some time now, and Darkin are starting to come up as a topic in the foreseeable future, so I'm trying to be prepared for the possibility of an adventure involving Darkin. How would you handle the whole conflict between Darkin and a PC/NPC? What sort of abilities would a Darkin weapon have, as well?
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