Dr. Sidney

https://www.dndbeyond.com/characters/86568412

 

Dr Sidney Vissel gives treatment to the sick, succor to the dying, and mercy to the condemned. He strives for perfection in his craft to a fanatical degree, even striving to practice on the unwilling that he deems unworthy. When crossed, he uses poisons and elixirs to take his targets unawares, and captures them for experimentation later. He now wants to observe a battlefield to see what combat healing might be like.

I wanted a way to try and twist a class that's generally altruistic and see if I could make it darker. An "Angel of Death" type killer has access and knowledge to do a serious amount of damage.