Goblin Vampire Alchemist novel

#1
Need a title of novel about goblin vampire alchemist novel.
Only heard of it by recommendations on imageboard.

Main Character is a goblin vampire who can only kill his victims in their sleep.
So he learns alchemy and roofies them with sleeping potions.
He also erases victim death log so people won't figure out how he kills tough guys.

https://i89.fastpic.ru/big/2017/0324/30/...77a730.jpg