Ad Astra Unlimited Resource Encyclopedia: A Shard of a One-Of-a-Kind
Artifact Shards are a special type of shard, instead of being used to upgrade an already placed building, they're used to claim an Artifact.
You need 100 of an Artifact Shard in order to claim that Artifact. More information on Artifacts can be found at:
Sources:
Crafting and Actions (Any)
???
Used by:
Claiming Artifacts