Reroll shards, also known as “reroll dice”, are the currency used to roll sub-module effects (”substats”) on modules.
Reroll Shards Dropped Per Tier
When using reroll shards, locking sub-module effects will raise the cost of rerolls as shown below.
The Reroll Shards lab increases the amount of reroll shards dropped from bosses.
Unlocking the Cash Card card mastery adds a chance for elites to drop reroll shards.