The Slag-Bone Colossus

The Slag-Bone Colossus (also classified in Second-Age Irungarten manuscripts as a Rukhsh-Forged Osteosteel Golem) is a terrifying, 25-foot construct-undead monstrosity born from the accidental fusion of pure Rukhshmen ("God-Goo"), hundreds of ancient refrigerated corpses, and thousands of pounds of boiling molten steel and bronze slag inside the subterranean ruins of Shatterstone Gorge.

Genesis: The Sunburst Meltdown

During the frontline vanguard's infiltration of the House Osrin subterranean facility on November 12, 2026:

The Leaked Soul-Distillate: Goblin sapper explosions ruptured ancient storage tanks, spilling gallons of luminescent orange Rukhshmen across the two-story industrial distillery. The fluid naturally reactivated ancient skeletal matter, knitting shattered bone fragments and animating a predatory sludge creature.
The Radiant Ignition: Cornered on a jammed cargo platform 70 feet in the air, Commander Andric DeVross unleashed an 8th-level Sunburst (dealing 82 radiant damage). The blinding solar heat incinerated the sludge horror, but also liquefied the surrounding 30-foot cylindrical steel stills, bronze release valves, structural iron I-beams, and catwalks into boiling molten metal.
The Congealing of Bone & Steel: As the boiling slag cascaded down upon hundreds of Second-Age cadavers lying in the distillery work cubicles, the hyper-regenerative properties of the Rukhshmen prevented the marrow from incinerating. Instead, the substance rapidly knitted the bones directly into the cooling molten metal, welding a colossal skeletal framework into heavy boiler plates and hydraulic iron conduits.
The Awakening: Ignited by the agony of thousands of trapped dwarven souls screaming from its internal chest furnace, the Slag-Bone Colossus awoke with an insatiable, magnetic urge to reclaim the four intact Rukhshmen canisters salvaged by the vanguard.

Anatomy & Capabilities

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THE SLAG-BONE COLOSSUS
Gargantuan Construct (Undead, Titan), Chaotic Neutral / Unaligned
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Armor Class:        19 (Fused Osteosteel Slag-Plating)
Hit Points:         310 (20d20 + 100)
Speed:              40 ft., Climb 30 ft.
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STR: 28 (+9)   DEX: 10 (+0)   CON: 20 (+5)   INT: 6 (-2)   WIS: 12 (+1)   CHA: 18 (+4)
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Damage Resistances: Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Damage Immunities:  Fire, Poison, Psychic, Radiant
Condition Immunities: Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned
Challenge:          17 (18,000 XP)
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Fused Osteosteel Carapace: Its exterior is an irregular shell of blackened, slag-welded boiler steel interwoven with interlocking ribcages and femur struts. Critical hits against it become normal hits, and severe trauma causes explosive shrapnel bursts of boiling slag and razor-sharp bone splinters.
Rukhsh-Knitted Osteo-Regeneration: Fueled by the concentrated divine soul-distillate pumping through its brass pipes, the Colossus constantly regenerates fractured metal and shattered bone (regaining 20 HP/round unless suppressed by cold or necrotic damage).
Soul-Bleed Furnace Aura: The boiler within its chest cavity radiates a 30-foot aura of psychic soul-bleed. Living creatures in its presence suffer psychic trauma and hallucinations of dwarven quarry whips as thousands of dead souls weep in unison.
Molten Shrapnel Spew: Can vent its internal pressure, discharging a 60-foot cone of boiling molten steel, superheated bone fragments, and burning orange soul-goo that restrains victims in hardening metal casings.
Kelemvor's Choral Shriek: Emits a deafening, resonant chime echoing the funerary bells of Kelemvor, stunning and deafening nearby combatants with thunderous sonic force.

Strategic Significance in Shatterstone Gorge

Clawing its way up the ancient Oghrann Pneumatic High-Bore vertical chimney, the Slag-Bone Colossus breaches the high pass directly behind the vanguard on the Dwarven Colossus Highway, precipitating a catastrophic three-way clash between:

The Purple Dragon Vanguard (escorting wounded and carrying the four stolen Rukhshmen vats).
The Stone Giant Outpost (occupying the high road and terrified by the unnatural abomination).
The Colossus (an unstoppable force driving inexorably toward the high ground).