Official Covenant Cards guide
Poison
Turn successful combat damage into a lethal trade against a unit.
What it does
When a Poison unit deals combat damage to another unit, that unit is destroyed. A hit fully blocked by Shield does not activate Poison.
A useful decision
An inexpensive Poison unit can threaten a much larger foe. Both units deal damage in the exchange, so your Poison unit may also be defeated.
Cards with this mechanic
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Covenant Cards is a work of historical science fiction. Characters, dialogue, powers, timelines, and events are creatively adapted for gameplay and are not an academic reconstruction of history or scripture.