This was the spell text (note it's from ages ago, before my sorcery rework stuff, so the format is different)
Butterflies to Chrysalides Bombardment
Cost: 35m
Target: Area (250 yard radius, centred on target point within 1 mile of sorcerer)
A Silurian innovation, this spell uses the motonic principles of Death of Obsidian Butterflies, but expands them up to the Sapphire Circle. As the sorcerer shapes the spell, a collection of butterflies, some in obsidian, others cast in a faintly fluorescent greenish-yellow glass begin to spiral the caster, their flight spelling out the Word of Complexity, which represents sudden change in faraway places from small alterations.
When the character releases the spell, they roll their Perception + Occult, adding their Essence in automatic successes. On the completion of the spell, the butterflies arc up into the air, coming down a tick later on the target location as a great swirling cyclone of enormous glass butterflies, each butterfly anywhere from a foot to a yard across. Everything within 250 yards of that target is subject to the attack. The attack descends from above, so any cover must be at least an inch of stone overhead to protect; the butterflies are quite capable of cutting through the roofs – and upper floors – of most Second Age structures to shatter on the inhabitants within.
Characters defend against Butterflies to Chrysalides Bombardment as if it was a hand-to-hand attack, and each attack is independent, so magic which protects only one person will not protect others subjected to the same attack. Treat the butterflies as rolling a number of attack successes equal to what the sorcerer's player rolled, -1 for each two dice of penalties that circumstances impose. In cases of thick fog or a heavy low cloud level, characters may have to reflexively roll (Perception + Awareness), Difficulty 1, to avoid it being a surprise attack. The attack inflicts 12L, plus any extra successes on the attack roll as per usual.
However, this spell does not merely litter the ground with broken glass (though it does so, much like Death of Obsidian Butterflies). The butterflies, in their brief flight, release small lumps of igneous rock, around the size of a man's fingernail, which litter the ground within the affected area. Compared to the brightness of the glass, they are dull and mundane. However, moving or Dashing across the affected area, for the next lunar month, risks life and limb. Each tick where the character moves or Dashes requires a (Perception + Awareness) roll, at a difficulty of half the sorcerer's Essence, and the roll may only be made if the character is aware of the danger. Failure means that a character's shadow has fallen on one of the chrysalides. From it, grows a spear-like bush made of fused butterflies made of black and green glass, directly pointed at the obstruction to the light, which then blossoms in a newly formed canopy at head height. This is modelled as a hand-to-hand attack against everything within 3 yards, which counts as having rolled the same number of successes as the original attack, and which inflicts +6L damage.
The spear-bush created are living creatures, but will wither and die, turning brittle, if not fed on blood. The Imperial Legions have strict policies for what is to be done if it is found that a legion has wandered in such a formation, often including the use of Earth Aspects to turn over the soil, safely defusing the unhatched chrysalides. Sapphire Circle Countermagic safely defuses all the chrysalides in the area; Emerald Circle Countermagic can disarm all the ones in an area equal to that produced by a casting of Death of Obsidian Butterflies, allowing a formation to be moved through a so-covered area. Once the lunar month has passed, the unhatched chrysalides turn inert, but any spear-bushes that have grown remain.
