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The Overdrive (大破壊) (オーバードライブ) is a massive explosion that happened in Symphonia 50 years ago before the series. Shiba was fighting with last the Dark Bring when Dark Bring unleashed a gargantuan explosion which destroyed over one-tenth of the entire known world. The impact eventually caused an atmospheric disturbance over the lost kingdom which resulted in the Death Storm, a weather phenomenon that surrounds Symphonia for 50 years until Haru's group arrived.
As the story progresses, it was revealed that the true destructive power of the Overdrive is capable of erasing an entire dimension coming from Endless