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

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?”

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