The faq says
Sister Mary and each other investigator on her space adds 1 to the result of each die rolled as part of an effect printed on a Condition card that has the BANE or BOON trait. This modification applies whether the die is rolled as part of a test or not.
(Yes I see the grammar error with "adds" in there.)
I know this applies to testing whether to keep or discard the cards on a reckoning, but do we get to add 1 also to all tests and effective nullify the Curse and boost the Blessed to allow rolls of 3-6 as successes? This just seems so powerful!