Vergil's focus bar

[Kaelus Von Sestiaf]

What exactly does Vergil's concentration/focus do, other than let him do Judgement: End? I assume there's a buff of some sort that it gives him?

[Wesker's Aneurysm☆]

His moves becomes more wise-ranged and more powerful.

[Milkey]

Bigger Judgement Cut,Effects and extra 3rd beowulf hit (3rd hit is god)