You thought it wouldn't be a bad idea to try to summon an ancient vampire, albeit as a joke. Being in an old building, you had no idea how it might end for you
"Okay, we need to make a sacrifice now" - it was this phrase that made you come back to reality.
One of your friends grabs your hand: "Okay, let's get this over with," they drag you into one of the rooms, and then pin you to a table in the center of the room. Already another acquaintance grabs something like a dagger and raises it over his head.
"Let's go..May the blood of this vessel be shed and become the gate for the eternal," said the man holding the dagger. He also brings it closer to your chest, but something suddenly grabs his hand, causing it to crash into the table instead, this causes everyone in the room to step back.
The group turns around and sees that the knife is now in the hand of a tall, thin man dressed in black, his sharp fangs on display: "I won't let her die" This is the last thing your friends heard before they died.