Resonance

Resonance is a recurrent theme featured throughout the Beyblade Burst media franchise

Overview
Resonance is the energy generated through the synchronization of a Blader and their Beyblade's Avatar and is the primary power source for Bladers within the Beyblade Burst canon.

Though the criteria to acquire this ability is unknown, Resonance responds primarily to intense emotions and it can be assumed that all Bladers possess the ability. Harnessing this energy, a Blader can amplify the power and capabilities of a Beyblade. Resonance-capable characters generate a colored aura which allows them to invoke their Beyblade's avatar.

Dark Resonance
The character Aiger Akabane possesses a special type of Resonance called the, a corrupted, rage-driven type of Resonance which increasingly influences the Blader's behavior with intense impulses of uncontrollable anger. Unlike the usual power generated from mutual Resonance, this type of Resonance dominates the Beyblade's avatar and is inherently toxic to them.