In this world when someone dies they transform into a bestial form depending on the level of sins they have committed within their mortal life; most simply transform into rats or rodents, petty criminals often end up as feline or canine like creatures; the truly despicable among us tread the line between animal and eldritch monstrosity.
The classifications go like this

>1 to 2 level: normal people
>3 to 4 level: drunks, abusers and petty criminals
>5 to 6 level: murderers, animal killers, bad blood dealers.
>7 to 8 level: serial killers, mass murderers, rapists, blood mad vamps.
>9 to 10 level: unknown

I work at the sin-beast retrieval and execution centre;
I go after sinbeasts classed level 5 or higher.

Currently I'm hunting a class 7 canine type sinbeast lurking within the city centre; the entire area has been curfewed till after the execution or non lethal retrieval.

The only sound I can hear is the red tinged steam pouring out of the vents, filling the street with a red hue and the air with the taste of iron.
The city centre draws closer and I ready my serrated scimitar and fit the tranquilizer darts to my wrist applicator.
The scent of blood grows thicker and I sense terrified eyes watching me;
I'm wearing the outfit of a senior sinbeast executioner.
Like most people in this city I rely on canine blood to give myself a bestial edge... though use too much and you lose your humanity to the desire for violence.
The sillhouette of the sinbeast comes into view, it's a canine with antlers like an elk.
It's hunched over a broken and twisted corpse, blood is spilling across the cobble stone.
My vision becomes crimson as the beast blood takes effect I can feel the animosity of a wolf burning through my veins.
I charge with my scimitar using an upward swing to slice the throat and end the fight quickly.
The creature notices me and dodges with agility to the side, the creature knocks me to the side with a single swipe also ripping through the thick leather of the overcoat I was wearing, a fatal blow if not for the metal plating hidden within.
I begin to stand but my knees fall out from under me.
The beast gets closer and I can hear a growl forming But in a blink of an eye the beast is clutching it's throat and hot red blood is pouring down upon me, soaking my clothes.
A clawed hand bursts through the beasts chest and for a moment I feel empathy for the creature as it slides to the ground, eyes fluttering closed.
Darting away I see a humanoid canine creature with blood matted fur and a serrated katana stained crimson.
Stunned for a moment I stay there within the puddle of blood.
Before using a steam powered blood collector to fill up some bottles with the beasts quickly drying blood.
If I sold all 3 bottles to the local refinery I could get a clean 300 gold on the side.
Blood of beasts this level is rare and expensive.
The stronger the beast the more intoxicating and energising the blood is.
I soak the beast in oil and light it aflame while speaking the sacred rites of the purpura cathedrali.
The sun begins to rise but it makes little difference due to the thick red fog covering the dark city.
The ornate spires rise high in the air as if to escape the red fog haunting the dim cobbled streets.
The bitter taste of iron fills my lungs but it's effects are strangely comforting it reminds me that I am still alive and not yet one of those dark creatures that stalk the red nights.

If the purpura cathedrali controls the city the sanguis distilleries keep it running.
Almost every district contains a distillery.
The most common drink among the commonfolk is the sanguine cocktail a mix of pest class blood and weak alcohol to calm the blood lust.
The distillery process works like this
First hundreds of pest class beasts are piled into a room, then they are crushed by a large metal press, the blood pours through the grated floor into pipes which lead into the main bottling plant... pure blood doesn't evaporate so the blood Is purified by boiling the impurity out hence tbe red mist drifting out of ventilation pipes to the surface covering the city in a dense red byproduct.