LotFP Spell: Black Flame

Alright, fellow RPG geeks, I am working on a Lamentations of the Flame Princess supplement to accompany the release of my novel Heraclix & Pomp, which is due out from Resurrection House press next Fall. I chose LotFP because I think the novel's ouvre best fits with the weird fantasy system. More on that some other time.

I have created the following Magic User spell, which is used at a certain point by my main villain, and wanted to “throw it out there” to see what your collective thoughts are. Things like “is it the appropriate level?”, “Would it unbalance the game by being either too strong or too weak?”, and “Does the range, duration, etc make sense?”

Note that Heraclix & Pomp takes place in an alternate Eastern and Central Europe in the 1750s-60s. The setting is low magic, I just happened to write about heroes and villains who are deeply steeped in magic, despite their mundane surroundings.

Here's the spell. Any help would be appreciated:

Black Flame

Magic-User Level 7

Duration: 1 Round/Level

Range: 80'

This invocation creates a curtain of black flame 20' square per caster level. This curtain can be “wrapped” around the spellcaster, so long as the total square footage is not violated. The wall emits non-damaging, but palpable cold up to 10' from the wall on either side, though the caster is not affected by the cold. Touching the wall in any way causes 1d6 of damage for every 4 levels of the caster's experience. This is treated as cold damage. Fire-using creatures suffer double damage. Anyone walking through the wall suffers the same damage as touching the wall, but must also save against magic or suffer one of the following effects, determined randomly:

1. Character permanently loses sense of smell.
2. Character blinded for 1 day
3. Character permanently loses 1 point of constitution
4. If the character is a Magic-User, he or she loses ½ of memorized spells for the day, randomly determined. If the character is a non-Magic-User, the character falls asleep for 1d4 turns
5. Character is badly burned and loses 2 points of Charisma, permanently
6. Character loses 2d4 points of Dexterity for 1 day

Note that the caster must maintain concentration for the wall to remain up.

Material components are a bone from an undead creature and several fresh drops of the caster's blood.

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