Kasdeja
the Serpent's Tutor — who taught the strikes of the serpents and the smiting in the womb.
Kasdeja — The Encounter
the Serpent's Tutor — who taught the strikes of the serpents and the smiting in the womb. · a boss your table can run with almost no prep. SRD 5.1-compatible.
Who Is Kasdeja
Kasdeja taught the strikes of the serpents and the darkest of the forbidden medicines. It fights as living venom: melting hit-point maximums, poisoning everything it touches, and filling the field with a nest of spectral serpents that no one wants to cross.
Run Kasdeja in Sixty Seconds
- Overpowered boss CR 19 fallen angel — legendary actions + Legendary Resistance.
- Magic Resistance advantage on saves vs. spells; plan your control.
- Nest of the Fallen its recharge AoE is the wipe threat — spread out.
- Immune to radiant, poison, fear, charm and resists most damage types.
- Part of the Grigori host deadliest fielded alongside the other Watchers and Semjaza.
Kasdeja
Large celestial (fallen watcher), neutral evil
CR 19 · 22,000 XP · GUIDELINELegendary Resistance (3/Day). If Kasdeja fails a saving throw, it can choose to succeed instead.
Magic Resistance. Kasdeja has advantage on saving throws against spells and other magical effects.
Venom of the Fall. Kasdeja's attacks ignore resistance to poison damage and reduce the target's hit point maximum by an amount equal to the poison damage dealt (until a long rest). A creature whose hit point maximum is reduced to 0 this way dies.
Actions
Multiattack. Kasdeja makes two Serpent-Strike Fangs attacks and uses Nest of the Fallen if available.
Serpent-Strike Fangs. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 17 (3d6 + 7) piercing damage plus 27 (6d8) poison damage, and the target must succeed on a DC 19 Constitution saving throw or be poisoned for 1 minute (repeat save at end of turn).
Nest of the Fallen (Recharge 5–6). A writhing mass of spectral serpents fills a 30-foot radius for 1 minute. The area is difficult terrain, and a creature that enters it or starts its turn there makes a DC 19 Constitution saving throw, taking 36 (8d8) poison damage on a failure, or half on a success.
Bonus Actions & Reactions
Coiling Recoil (Reaction). When Kasdeja is hit by a melee attack, the striking limb is bitten: the attacker takes 22 (4d8) poison damage and must succeed on a DC 19 Constitution save or be poisoned until the end of its next turn.
Legendary Actions (3/Round)
Strike (Costs 1 Action). Kasdeja makes one Serpent-Strike Fangs attack.
Envenom (Costs 2 Actions). One creature within 10 feet must succeed on a DC 19 Constitution save or take 27 (6d8) poison damage and have its hit point maximum reduced by the same amount until it finishes a long rest.
A woman-shaped tangle of serpents and open mouths, every scale a tiny fanged angel. Kasdeja taught the strikes of the serpents and the bitter arts of the womb, and where it passes the ground still hisses.
Kasdeja, Bound
Companion · acts on your initiative
Bound · GUIDELINELegendary Resistance (3/Day) (signature). If Kasdeja fails a saving throw, it can choose to succeed instead.
Actions
Serpent-Strike Fangs. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 17 (3d6 + 7) piercing damage plus 27 (6d8) poison damage, and the target must succeed on a DC 19 Constitution saving throw or be poisoned for 1 minute (repeat save at end of turn).
Reactions
Coiling Recoil (Reaction). When Kasdeja is hit by a melee attack, the striking limb is bitten: the attacker takes 22 (4d8) poison damage and must succeed on a DC 19 Constitution save or be poisoned until the end of its next turn.
The same Large celestial, bound as a lesser ally and set to guard whoever summoned it.
Guideline numbers — formula-tuned and read from the miniature's design, not yet table-proven. Tell us how it ran in the comments.
How It Fights — by Tier
Same creature, scaled threat. The traits never change; only the numbers move.
A vastly diminished echo of Kasdeja for a mid-level party — same role, far softer numbers. It is the host's slow-kill — its poison shrinks the party's maximum HP toward zero and its serpent-nest denies whole zones. Left alive, it wins by attrition no amount of healing fully undoes.
A weakened Kasdeja, still a serious boss. It is the host's slow-kill — its poison shrinks the party's maximum HP toward zero and its serpent-nest denies whole zones. Left alive, it wins by attrition no amount of healing fully undoes.
It is the host's slow-kill — its poison shrinks the party's maximum HP toward zero and its serpent-nest denies whole zones. Left alive, it wins by attrition no amount of healing fully undoes. This is its true, overpowered form — a legendary-tier fight.
Put Kasdeja on the table
Download the presupported STL and run the fight tonight — the model, and the encounter that comes with it.
Get the STL on MyMiniFactory →Clay Cyanide Companion Rules v1
How a bound creature acts
- A companion acts on its owner's initiative, immediately after the owner.
- It uses the Companion block above — roughly ×0.6 HP and damage, no recharge abilities, and at most one reaction trait.
- It moves freely; it takes its Action only while its owner is conscious.
- At 0 HP a companion is broken, not dead — restored on a long rest unless your table rules otherwise.
Original Clay Cyanide material © Clay Cyanide LLC — explicitly not the non-SRD official sidekick rules.
Questions, Asked at the Table
What CR is Kasdeja?
At its native tier Kasdeja is CR 19 — a deliberately overpowered fallen-angel boss. Scale the AC, HP, to-hit, and save DC to the tier line matching your party's level.
How does Kasdeja fight?
It is the host's slow-kill — its poison shrinks the party's maximum HP toward zero and its serpent-nest denies whole zones. Left alive, it wins by attrition no amount of healing fully undoes.
Why is Kasdeja's poison so dangerous?
It doesn't just deal damage — it permanently lowers your hit point maximum until a long rest, and a max reduced to 0 is death. Ordinary healing can't outrun it. Kill Kasdeja quickly or bring greater restoration and poison immunity, because a long fight is a losing one.
Tell Us How It Ran
This work includes material taken from the System Reference Document 5.1 ("SRD 5.1") by Wizards of the Coast LLC and available at dnd.wizards.com/resources/systems-reference-document. The SRD 5.1 is licensed under the Creative Commons Attribution 4.0 International License available at creativecommons.org/licenses/by/4.0/legalcode.
Clay Cyanide Miniatures is not affiliated with, endorsed, sponsored, or specifically approved by Wizards of the Coast LLC. This content is compatible with the fifth edition of the world's most popular fantasy roleplaying game. Companion rules, lore, names, and original mechanics © Clay Cyanide LLC.
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