Kaustros the Chronicler, a Brass Dragonborn Blood Hunter — D&D 5e NPC portrait
#0231

Kaustros the Chronicler

"The Brass Regression"

Male, he/him · Middle-aged, 47 years

Ability Scores

STR
16
+3
DEX
14
+2
CON
16
+3
INT
18
+4
WIS
10
+0
CHA
12
+1

Combat

Armor Class
15
Studded Leather Armor + Dex
Hit Points
63
Hit Dice: 7d10
Initiative
+2
Speed
30 ft. (40 ft. in Hybrid form)
Proficiency
+3
Passive Perception
13

Attacks

Crimson Rite Longsword+61d8+3 slashing + 1d6 fire (Crimson Rite)
Obsidian Bite (Hybrid Form)+62d8+3 piercing + 1d6 fire
Breath Weapon (Fire, Recharge 5-6)3d6 fire in 15 ft. line, DC 13 DEX save for half

Personality

Personality

Speaks in rapid, excited bursts even while transforming, pausing mid-sentence to scribble observations in a leather journal that's somehow always within reach. Refers to his curse as 'the Regression' with the fondness of a pet project. Will cheerfully interrupt combat to ask if anyone has a measuring tape.

Ideal

Knowledge has no moral weight—only accuracy. If understanding requires becoming the monster, then the monster must be documented.

Bond

His seventeen field journals, each one meticulously annotated with transformation data, anatomical sketches, and dried bloodstains labeled by date. He would burn a city to retrieve them.

Flaw

Cannot resist triggering his transformation 'just one more time' to test a new hypothesis, regardless of who might be standing nearby or how much control he's already lost that day.

Backstory

Kaustros discovered the Order of the Lycan not through tragedy, but through an academic paper. While cataloging draconic genealogies in the Great Library of Candlekeep, he stumbled upon fragmentary notes describing 'predatory reversion in scaled bloodlines'—lycanthropy that didn't produce wolves, but something older. Something with claws that remembered the Tyranny of Dragons. Most scholars would have filed the research away. Kaustros infected himself within the month.

The transformation exceeded his wildest hypotheses. When the curse took hold, his brass scales didn't merely thicken—they darkened to obsidian ridges, his jaw elongated into something prehistoric, and his blood ran hot enough to scorch parchment. He began documenting everything: heart rate during the shift, muscle density at peak transformation, the precise angle his spine curved when the predator within seized control. His colleagues called it madness. Kaustros called it 'the breakthrough of the century' and packed his bags for fieldwork.

Now he wanders desert ruins and forgotten battlefields, deliberately triggering his Primal Regression to chase a theory: that lycanthropy doesn't corrupt dragonborn—it reveals their ancestral form, the apex predator that existed before civilization dulled their claws. He has filled seventeen journals with meticulous observations, sketches of his own mutating anatomy, and bite-force measurements taken mid-rampage. He is unfailingly polite, even as his bones crack and reform. He simply asks that you 'please maintain adequate distance' and 'note the time for the data set.' The fact that he occasionally wakes up covered in blood and can't remember whose is a minor variable he's still refining.

Abilities & Actions

Primal Regression (Hybrid Transformation, Recharge after Short or Long Rest)

As a bonus action, Kaustros triggers his lycanthropic curse, transforming into a monstrous hybrid form. His brass scales blacken to obsidian plates, his snout elongates, and thick fur sprouts along his spine and limbs. For 1 hour, he gains the following benefits: +3 to AC, advantage on Strength checks and saves, an additional 1d6 slashing damage on melee attacks, and resistance to bludgeoning, piercing, and slashing damage from nonmagical attacks. His speed increases to 40 feet. While transformed, he must succeed on a DC 12 Wisdom saving throw at the start of each turn when he sees a hostile creature or lose control, attacking the nearest creature (ally or enemy) with reckless abandon. Even while feral, he occasionally mutters anatomical observations.

Obsidian Bite (Regression Form Only)

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 2d8+3 piercing damage plus 1d6 fire damage. Kaustros's elongated jaws carry both draconic heat and predatory force. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone. After landing this attack, Kaustros often pauses to estimate the bite force 'in pounds per square inch.'

Ancestral Fury (Recharge 5-6, Regression Form Only)

Kaustros taps into the primal rage of his draconic ancestors. As an action, he releases a guttural roar and makes two Obsidian Bite attacks against a single target. If both attacks hit, the target must succeed on a DC 14 Constitution saving throw or suffer one level of exhaustion as their vitality is drained by the sheer ferocity of the assault. Kaustros typically apologizes afterward while checking his pulse.

Field Notation (1/Day)

As a reaction when Kaustros or an ally within 30 feet takes damage, he rapidly scribbles observations in his journal, analyzing the attack's vector and potency. The target gains resistance to that damage type until the end of their next turn. Kaustros must be holding his journal and pencil (he always is). He cheerfully narrates aloud: 'Note: piercing trauma, lower left quadrant, possibly arterial—hold still, this is important!'

Regression Catalyst (Self-Harm Trigger)

Kaustros can trigger his Primal Regression transformation even if it has been expended by using a bonus action to slash his own forearm with a blade, taking 1d8 slashing damage that cannot be reduced or prevented. This reckless act jump-starts the curse through pain and adrenaline. He often does this mid-conversation, casually remarking, 'Time for another trial run.'

DM Notes

Kaustros speaks in the bright, caffeinated cadence of a university lecturer who just discovered caffeine. Even while his bones are audibly snapping, he'll pause to say things like, 'Remarkable! The clavicle realignment is three degrees sharper than last Tuesday!' His signature gesture is tapping his temple with a charcoal pencil, leaving smudged fingerprints on his scaled brow. He keeps a tiny silver bell tied to one of his horns that jingles faintly when he tilts his head in thought.

When introduced, he's usually elbow-deep in some ancient ruin or standing over a fresh kill he doesn't remember making, scribbling furiously. His opening line is often: 'Ah! Witnesses! Excellent—could you describe the coloration of my eyes during the latter third of the transformation? I suspect a spectral shift toward amber.'

He reacts to danger with cheerful curiosity rather than fear, often treating ambushes as 'unplanned data opportunities.' The one thing that will make him genuinely angry is someone destroying or disrespecting his journals—he will transform immediately and without hesitation. He's a wonderful NPC for DMs who want a 'mad scientist' energy that's more enthusiastic than evil, and a lycanthrope who treats his curse like a research grant.