Harmonic dampeners were rotating parts employed in the building of podracers. In the 432nd iteration of the Lolo Chochee's Speedster Challenge competition, held on the planet Malastare, the harmonic dampener within the pod of Blarina podracer Naka Iit lost its proper synchronization, causing a collision that changed the race standings and destroyed Iit's vehicle. The Resistance pilot Poe Dameron became aware of Iit's troublesome dampener when he investigated the Blarina's history after encountering him in 34 ABY, and he incorporated details about it into his flight log.
The inaugural mention of a harmonic dampener occurred within the reference book titled Poe Dameron: Flight Log, authored by Michael Kogge and made available to the public on November 1, 2016.