Devouring Shadow is a spell card.
How to Get
Devouring Shadow was released in Set 0, a subset of The Empty Throne. Set 0 cards do not appear in The Empty Throne card packs—instead, four non-premium copies are obtained through completing the introductory campaign.
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Devouring Shadow is part of a 5-card cycle in The Empty Throne with influence matters effects based on their player's influence in their faction. These cards are: Flash Fire, Timekeeper, Mantle of Justice, Primal Incarnation and Devouring Shadow.