Nickname(s): Harbinger of Disease, Pestilence, The Surgeon, and other plague-related alias that Sebastian didn't ask for.

Age: 112 (based on the accumulated number of molted scales he produce through out the years)

Race: Ex- Human/Basilisk-lich

Background:

He is death.
The bane of all things living.
The sickness that plagues the earth.

Despite all of this grandiose title, Sebastian is not always this aloof, cynical, cold-blooded(figuratively and in a literal sense) harbinger of plague and the avatar of pestilence he is today.

Oh no, quite the contrary, Before turning heel and serving the Demon Lord Ahriman's legion. He was a workaholic middle-aged corporate dude who didn't ask to be reincarnated into another world. He was once a mere human. A lesser isekai protagonist who got the short end of the stick.

A naive, optimistic, caring spell caster that is a part and supports a 'mid-tier' hero's band of adventurers. He was their designated healer and the hardest worker in that party. Although He does his job so well, Sebastian barely gets any praise for his efforts. often belittled by his party members in their adventures.

Sebastian is a natural man of talent when it comes to healing arts, potion concoction, and aiding his comrades. So much so, that he is the only reason that his 'reckless' party hasn't entered Death's door just yet.

Well ...until that fateful day when he and his cocky party members bit more than they can chew by delving into the Viper god's temple, facing the Snake Deity Atziri herself, and got completely annihilated for being 'idiots' for rushing in trying to do their flashy heroic moves on the Snake God whose way above their adventurer's paygrade as Sebastian would put it in his final moments.

Most of them barely escaped with their heads attached, but Sebastian was not so fortunate and was the sacrificial bait in doing so.

He was killed and was reincarnated as a prisoner, serving the Snake god and the snake people of the temple. Even being reincarnated as a part reptilian/ part human, Sebastian's work ethic didn't falter, he work as hard as he was in his past life as a human healer.

To his surprise, the basilisk tribe was quite accommodating of their kin and his talents were much appreciated here than he was in that jerk of a Hero's party.

As the years, decades go by, Sebastian makes his way up the corporate ladder and makes it up to the higher ranks in the snake hierarchy.

The viper queen herself calls upon Sebastian for his unfaltering dedication, where his talents are recognized, promoting him into her most trusted general, bestowing him with the highest power of their snake overlord.

from there, Sebastian's view of this world changed. he became a heartless machine, vengeful, rejecting his humanity due to his previous experience siding with humans. turning him into a cold-blooded, slithering, devotee and emissary for the Snake-god with zero empathy for the human race whatsoever.

As a sign of good faith and allegiance to the demon lords, The Viper Queen sends a recommendation letter to Lord Ahriman, entrusting Sebastian to work under his jurisdiction in the fight against those 'otherworldly heroes'

Skills and Abilities:
What Sebastian lacks in physical strength and frail body makes up for his ability to cast powerful venomous poison spells, inciting a plague that can wipe an entire town from his horrific experiments.

Sebastian possesses snake-like features such as molting his skin to regenerate, night vision to see in the dark, fangs that can pierce through skin, and can summon a variety of snakes at his whim. He can also turn his skin into scales, toughening his exterior against most blunt attacks.

His eyes are his greatest features, staring through them for a long period of time can petrify a man to his doom.

He is quite knowledgeable in all sorts of medicine, as well as many forms of toxins for any occasion, and other high-tier alchemy due to his previous life as a healer/alchemist.

Quips:
Sebastian is a workaholic and a shut-in. spending most of his time indoors, experimenting god knows what toxins he can think off inside his laboratory. He is rarely seen in the outside world unless needed or call upon by his superiors.

A germaphobe when it comes to his surroundings and barely socializes with others, he is often depicted as an emotionless person. a hard face to read by. A genuine kuudere.