It's Season One, Episode 20 Dead Man's Blood and it's all things vampire! We've got creepy fish teeth! Vampire sheep! And financial planning for the immortal! Learn the definition for "grave eating." Team Trunk also gets a new rival in Team Truck.

Sources:

http://www.supernaturalwiki.com/The_Colt

https://en.wikipedia.org/wiki/Trillium

https://wizzley.com/serbian-vampire-peter-plogojowitz/

http://theunexplainedmysteries.com/2017/07/24/vampire-peter-plogojowitz/

https://www.vampires.com/the-legendary-arnold-paole/

https://anomalien.com/the-case-of-arnold-paole-real-life-vampire-story/

The Vampire: A New History Groom, Nick 2018.

Supernatual: The Official Companion Knight, Nicholas, 2007