Tome of Horrors is a relic card.
How to Get Edit
After purchasing the Promises by Firelight campaign, beating a mission unlocks a playset of Tome of Horrors.
Premium versions of Tome of Horrors also unlock if the premium campaign is purchased. Without it, the premium cards can be crafted for Shiftstone, after being unlocked in the mission.
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|1.49.0...||Released in Promises by Firelight.