Closer to the Epicenter makes fear bombs work on enemies who have not been alerted yet, as long as they are in the middle of the blast.
Closer to the Epicenter sits at position 6 of 7 in the Fear tree. Unlocking Closer to the Epicenter takes 6 skill points. You need level 10 and Make Some Noise! before you can buy it. Closer to the Epicenter belongs to the Fear set Evie uses in the Jack the Ripper expansion, learned from the Indian Assassins.