Ahsoka Tano and Kanan Jarrus reach out to Darth Vader through the Force.
Force Sense was a literal sixth sense that enabled Force users to perceive something their natural five senses could not. Ezra Bridger was drawn to Kanan Jarrus due to both individuals' Force sensitivity. Similarly, both Ezra and Kanan were able to sense Darth Vader's presence in the Force when they returned to Lothal. Force Sense could also be used to sense another's emotions, as Ezra felt Maketh Tua's fear for her own life, as well as her honesty, and once sensed danger which warned him of Valen Rudor trying to fire upon him, and dodged in the nick of time.
Force Sense also allowed one to sense familiar essences in the Force. The Inquisitor used the body of Jedi Master Luminara Unduli to lure Kanan Jarrus to The Spire, as he could sense her presence through her remains. Later on, Ahsoka Tano and Darth Vader sensed each other's presence during Vader's attack on Phoenix Squadron, revealing to him that his former apprentice was alive.