power up your artifacts cards in your profile

They can level up your artifacts ( if you own any, check marketplace for that) so you earn more ARP.

upgrade artifacts

They allow you to upgrade artifacts. The old forum has info about how many fragments it takes to upgrade an artifact and what each level of the artifact does. Here is a link to the page:

https://na.alienwarearena.com/ucf/show/2167784/boards/awa-information/ForumPost/artifacts-info-250131-artifact-zorathian-cosmotheque-marketplace-1000-arp-5-10-fragments-calendar-day-28-marketplace-150-arp