Ethereal Pact is a strain fighting art card found within the Echoes of Death white box expansion.
Card Text[]
Add +3 to your brain trauma rolls.
When you suffer the Impossible!, brain trauma, the fungus in your head connects to the dreaming. 
Birth of a Savior and choose a dream. (If you've already reached Age 2, you cannot gain your dream's secret fighting art.)
If you are a savior, this fighting art has no effect.