Tovin's Comet

An inky cosmic cloud appears above the target location as a comet streaks through. As twinkling stardust falls continuously, revealing invisible creatures in the radius, choose one of the following fates:

Fortune: Choose a number of creatures up to equal to your Intelligence modifier within the radius. Targets have advantage on all of their attack rolls, and have bless cast on them.

Omen:  A number of creatures up to equal to your Intelligence modifier within the radius must make a Charisma saving throw. Creatures that fail this roll have disadvantage on all of their attack rolls, and have bane cast on them.