I nearly have 700 dark shards and I have a Maskeraith. Shards are pretty much useless (except for crafting) while minerals are. So, how about using those shards to craft some minerals.
Maybe for every 3 dark shards, you'll get a dark matter mineral. Too exploitable? Fine, we could make it 5 - 10 shards per mineral. This would make a shard sink along with the mineral sink that's happening.
As for breaking the minerals, you can break them, but will receive 3 - 7 shards back.
60% chance of receiving 3 shards back.
50% chance of receiving 4 shards back.
40% chance of receiving 5 shards back.
30% chance of receiving 6 shards back.
20% chance of receiving 7 shards back.
Yes! and let us break down our dark matte bombs into minerals!