Shadowbox
commonShadowbox is a common artifact in Monster Train 2. Its game-data effect is:
When you play your 20th Snack unit of the battle, deal 200 damage to enemy units on all floors.
“Supposedly, these crystal “Shardsouls” once contained sacrificed souls and were created by the Exiles in a gambit to save Heaven, Hell, and Human. Now empty, the crystal’s remains house many Morsels. This may confirm my theory that the Umbra Shroud is made of pure soul.”