That’s a Dark Souls boss bar, name should be above the left side 😉

Health bar grows wider than the screen, boss takes the health bar and smashes you to death with it. Fade to black. You died

After a long and hard fight, you manage to get the health bar down to zero - but instead of a victory screen, it fades to black and a cutscene starts playing.

“It has been a long time since my first form has been bested. But art thou prepared for the torment delivered unto thee by the next eight?”