The Frostbound Tyrant

Long ago, in the frozen north where the auroras dance like fleeting spirits, there was a white dragon of unparalleled majesty and power, known as Erythrax the Eternal Glacier. Unlike others of his kin, Erythrax was no mere beast of greed and savagery—he was a protector of the frozen lands, a guardian of balance between mortals and the elements. Yet, his legend turned to tragedy when a terrible poison seeped into his veins.

The tale speaks of a great battle between Erythrax and an ancient evil—an archdruid of decay who sought to melt the glaciers and flood the world with disease. Though Erythrax triumphed, the druid’s dying breath unleashed a venom so potent it cursed the mighty dragon forever. His once-pure frost turned venomous, his breath and blood tainted by this mysterious, unending poison.

Erythrax’s fight against this curse endures through the ages, his frozen heart burning with a singular purpose: to find a cure. Those who pledge themselves to his cause are marked by his icy power and the venom that runs through his veins. In return, they are granted the strength to stand against the spreading corruption that threatens the world.

Venomous Frost

The venom that afflicts Erythrax now courses through you, entwined with his frosty essence. Any poison damage you deal ignores resistance or immunity, as this venom carries the bitter chill of a dragon’s wrath.

Frostbound Mark

The mark of Erythrax appears as a frostbitten sigil, searing the target with cold and venom. Until the curse ends, you deal an extra 1d6 poison damage to the target whenever you hit it with a spell attack. The venomous frost in your magic lingers, chilling their veins. (You can only apply this damage once per spell even if there are multiple spell attack instances, such as with eldritch blast.)

If the target drops to 0 hit points before the curse ends, you can use a bonus action on a subsequent turn of yours to curse a new creature. Only one creature can be affected by this mark at a time.

Frozen Reprisal

When you take damage, you can use your reaction to unleash a wave of venomous frost. The triggering creature must make a Constitution saving throw against your warlock spell save DC or become poisoned for 1 minute. The icy venom fills their lungs and stiffens their limbs, sapping their strength. An affected creature can repeat the saving throw at the end of each of its turns, ending the condition on a success.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Glacial Heart

Erythrax’s curse has made you immune to disease, poison damage, and the poisoned condition. The venom in your veins, tempered by frost, has made your body as unyielding as a glacier and as pure as freshly fallen snow.

Breath of the Cursed Glacier

Starting at 14th level, your magic channels Erythrax’s cursed breath. When you hit a creature with an attack, you can use this feature to infuse the target with the sorrow of his unending fight. The target must make a Wisdom saving throw or be paralyzed and poisoned for 24 hours. The venomous frost spreads through their body, locking them in place as they succumb to despair. The paralysis ends if the creature takes damage or is no longer poisoned.

Once you use this feature, you must finish a short or long rest before you can use it again.