It's Beruka!
Reinhardt shown in the video is +Atk with +1 attack from merges. My beruka is neutral resistance. No change from my normal build except use of quickened pulse.
If the reinhardt had moonbow instead of draconic aura, it would deal 6-7 additional damage(22 Resistance x 30% = 6.6), still not enough to kill.
Beruka is not buffed at all, but she is under the effects of goad fliers from subaki, which has no impact on the battle.
Unbuffed beruka vs unbuffed reinhardt, Beruka wins everytime. Meet your newest counter Reinhardt!
Naturally a buffed beruka beats a buffed reinhardt too.
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