Blood Offering
From Arkham Horror Wiki
Blood Offering is a cult encounter. It first appeared in The Black Goat of the Woods expansion.
Card info
"Service demands sacrifice."
Either discard 1 Ally, discard 2 toughness worth of monster trophies, or lose 3 Stamina. If you cannot or will not do any of these things, discard your Cult Membership and move to the street.