Notes from author
First of my 'four horsemen' builds, pestilence focuses on both poison and toxic damage. The armor itself is not best for style but is fairly good for defense. the dark grain ring isn't necessary either but the flips and their invincibility frames really help, especially when you come across someone with a darkwood grain ring too. I would probably say the weapons (doesn't have to be ascended flame though) are necessary as the damage is good, it has toxic build up and the iron round shield's heavy deflection really helps in most situations, especially if you are not using ninja flips. If blocking is not wanted then dark silver tracer, and gold tracer, is a viable option too. Hope you find it interesting.
Also for a backstory, the player was a master of toxins, until he was killed by the very poisons they created. Fate had other plans, as they were resurrected by the godess velka, taking on the form of pestilence the horseman of the plague and poison.