Disenchanting unwanted shards converts them into same-tier dust that can be exchanged for another pack.
PC / Global, current live build
WHERE & HOW TO FARM
Where to farm
Shard inventory for disenchanting, then the War Recruiter for dust exchange.
Turn unwanted shards into shard dust, then trade ten dust of a tier with the War Recruiter for one new shard pack. This is a processing loop rather than a guaranteed way to obtain a chosen shard: the new pack is random. Use it when you have shards you do not need and want another roll from that tier’s pool. Check the shard’s tier before disenchanting so the resulting dust supports the pack you want.