Shard Dust

Shard Dust is an Item available within The Color of Madness DLC which can be bought during the Provision. The cost is paid with Shards instead of gold.

Use
It adds a buff for +1 SPD and +15% Dmg for 1 battle, but at the cost of a quest-long debuff on virtue chance by -10% and received stress amount by +10%.

In summary Shard Dust is a risky item in any combat, since it applies physical damage to it's user it should be consumed, before combat for it's maximum lasting effect being aware of stress. After consumption it is advised to eat some food rations, before combat to restore lost health.