Vampire

The vampire is an enemy encountered at room 460, he wears black clothing and has his fangs shown. His attacks cause you to "Bleed", draining about 20% of your health on hit, this means that you will constantly lose health every few seconds and hinders your regen ability, but it doesn't stack, the duration only resets if hit again.

Hard mode
In hard mode, the vampire will have the ability to dash to the player, making vampire much harder. However, when the player is hit while the vampire is dashing, the player will not get the bleed effect. It will also prevent your ability to regenerate stamina, alongside consuming stamina at a 2x rate. This isn't so bad in paper, as you can get a head start from his slow appear time and slow movement speed. You will still have a very small portion left, you can constantly tap shift for small bursts. Don't tap too fast or you will constantly get the "Do YoU wAnT tO TuRn On StIcKy KeYs?!?!?!?" message if your a pc/laptop user, making you unable to move until you close the message. If you do want to spam shift, I strongly advise that you disable the sticky keys popup in your pc's settings menu.

Trivia
Vampire is the only monster in the game that causes bleeding.

There was a typo in the post where bleed effect was misspelled was breed effect we don't talk about that 😞😞