Ekko's Z-Drive

The Z-Drive, or Zero Drive, is the time-rewinding device Ekko builds in season 2. After the anomaly at the Hexgates throws him and Heimerdinger into a parallel universe, the two work on a way back and manage to contain a tiny anomaly inside the device. Pulling the Z-Drive's chain rewinds the world around Ekko and returns him to an earlier position, giving him a do-over of up to about four seconds; pushing it further risks harming his surroundings.