“The Rumbling" is the opening to the last season part 2 of Attack On Titan (進撃の巨人). The TV Size version was released alongside the First Episode of Attack On Titan The Final Season Part 2. While the full version was released on February 7, 2022.
The song ties in and captures Eren’s perspective for the last season. Eren has a catastrophic plan and fights to control his own destiny.