As a Magic action, you can manifest a harmless, temporary omen within a 1-mile radius of yourself for 1 hour. This might include creating an eclipse on command, forming the clouds into a terrible face, conjuring pests, transforming water into blood, or causing the earth to tremble. For the duration, you add 1d4 to D20 Tests you make.
Once you use this feature, you can't use it again until you finish a Long Rest.