You have learned how to calculate the likelihood of what a creature might do next. You may, as an action, make a Intelligence (Investigation) check against a creature of your choice, the DC being their passive Charisma (Deception) (10 + Charisma (Deception) modifier). Upon a success, you gain insight into what that creature might do, but it is blurry. You can only see into the future for 1 minute, and it requires concentration. You may do this only once, being able to do so again after finishing a long rest.

For the next minute, the following applies: You have advantage on attack rolls against the target, and you have advantage on saving throws caused by them. The target has disadvantage on saving throws caused by you and on attack rolls against you. Examples of causing a saving throw include causing a cave-in and casting a spell that requires a saving throw.

You may use a bonus action to communicate this glimpse of probability, any one who hears is granted advantage on attack rolls against the target. However, if the target hears your calculated future, the effect is nulified for all creatures.

Additionally, you have learned how to calculate the likelihood of where any creature will be when you attack. You add half your Intelligence modifier rounded up to all attack rolls.