Libris Mortis: Necrotic Cysts


Mother Cyst is an additional feat choice for characters willing to make a greater commitment to necromancy. A player can select this feat with DM approval. The listed spells are added to the spell list of any available classes.

Mother Cyst

Prerequisite: Suffered the effects of Necrotic Cyst


You develop a tumor of undead flesh called a mother cyst. The cyst may be noticeable as a discolored swelling on your skin, if desired. This is considered a necrotic cyst by spells which require one, though it cannot be cured. You learn the selection of spells listed below. You always have these spells prepared, and they don’t count against the number of spells you can prepare each day.

You may innately cast a spell learned in this way at its lowest level. When casting these spells, treat the mother cyst as a spellcasting focus. Once you cast a given spell this way, you must finish a long rest before you can cast it innately again. Your spellcasting ability for these spells is Constitution.

  • When you first take this feat your Necrotic Cyst becomes permanent and benign, you learn the cantrip necrotic awareness
  • At 3rd level and higher, your cyst develops into a full Mother Cyst. You learn the spell necrotic cyst.
  • At 5th level and higher, your cyst swells and strengthens. You learn the spell necrotic scrying.
  • At 9th level and higher, your cyst strengthens again. You also learn the spell necrotic burst.

Necrotic Awareness

Necromancy cantrip


  • Casting Time: 1 action
  • Range: 30 feet
  • Components: V, S
  • Duration: Concentration, up to 10 minutes

For the duration, you know if there is a necrotic cyst (see spell of the same name) within range, as well as where the creature bearing it is located. If a cyst-bearer is outside your line of sight, then you discern its direction but not its exact location.

The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.



Necrotic Cyst

2nd-level necromancy


  • Casting Time: 1 action
  • Range: Touch
  • Components: V, S, M (a mother cyst)
  • Duration: Concentration, up to 10 minutes

You touch a creature who must make a Constitution saving throw. On a failed save, the creature is afflicted with a necrotic cyst. The cyst is either noticeable as a slight bulge on the creature’s skin (wherever you chose to touch the target) or it is buried deeply enough that it is not immediately obvious. The spell fails if the target has immunity to possession by undead (such as Protection from Evil and Good).

For the duration of this spell, melee weapon attacks made by undead and spell attacks from necromancy spells against the target deal an extra 1d4 necrotic damage on a hit. Additionally, the target makes saving throws against further necromancy spells with disadvantage for as long as the cyst remains.

The cyst can be removed by any effect which would cure diseases or with a DC 20 Wisdom(Medicine) check. The procedure is a bloody, painful process that incapacitates the creature for 1 hour. If the check fails by 5 or more, the creature is killed.

At Higher Levels. If you cast this spell using a spell slot of 3rd level or higher, the duration is concentration, up to 1 hour. If you use a spell slot of 4th level or higher, the duration is up to 8 hours. If you use a spell slot of 6th level or higher, the duration is 24 hours. If you use a spell slot of 8th level or higher, the spell lasts until it is dispelled. Using a spell slot of 5th level or higher grants a duration that doesn’t require concentration.


Necrotic Scrying

3rd-level necromancy


  • Casting Time: 1 minute
  • Range: Unlimited
  • Components: V, S, M (a mother cyst)
  • Duration: Concentration, up to 1 hour

You can concentrate upon an individual who you harbors a necrotic cyst, and cast your senses out to them almost as if you were there. For the duration of the spell, you can use your action to see through the creature’s eyes and hear what it hears, and continue to do so until you use your action to return to your normal senses. Distance is not a factor, but the spell fails if the individual no longer bears the cyst or if the cyst bearer is no longer on the same plane of existence as you.

You may also cast the following spells originating from your target, as though they had cast the spell: magic mouth, message, see invisibility, necrotic burst and darkvision.


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Necrotic Burst

4th-level necromancy


  • Casting Time: 1 action
  • Range: 100 feet
  • Components: V, S, M (a mother cyst)
  • Duration: Instantaneous

Choose a creature currently bearing a necrotic cyst, that creature makes a Constitution saving throw. On a failed save the target takes 6d10 necrotic damage and its hit point maximum is reduced for 1 hour by an amount equal to the necrotic damage it took. On a successful save, it takes half as much damage and its hit point maximum is unchanged. If the creature is killed by this damage, the cyst has expanded beyond control. On the round following the creature’s death, the cyst exits the flesh of the slain creature as a free-willed skulking cyst.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each slot level above 5th.


Skulking Cyst

Small undead, chaotic evil


  • Armor Class 14
  • Hit Points 33(5d6 + 15)
  • Speed 15 ft., climb 15 ft.

STR DEX CON INT WIS CHA
10 (+0) 19 (+4) 15 (+3) 3 (-4) 6 (-2) 4 (-3)

  • Condition Immunities prone, poisoned, exhaustion
  • Damage Immunities poison
  • Senses darkvision 60 ft., passive Perception 8
  • Languages understands Common but can’t speak it
  • Challenge 2 (450 XP)

Innate Spellcasting (1/Day). The cyst can innately cast necrotic cyst(spell save DC 13), requiring no material components. Its innate spellcasting ability is Constitution.

Undead Fortitude. If damage reduces the skulking cyst to 0 hit points, it can make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the skulking cyst drops to 1 hit point instead.

Actions

Attach Intestines. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d4 + 4) bludgeoning damage. If the target is a Medium or smaller creature, it is grappled (escape DC 10). Until the grapple ends the skulking cyst may not use attach intestines on another creature.

Blood Drain. Melee Weapon Attack: +6 to hit, reach 5ft., one creature grappled by the skulking cyst. Hit: 2 (1d4) necrotic damage and the target’s hit point maximum is reduced by an amount equal to the necrotic damage taken.

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