Ravens
By inverting the process of crystallising manifest darkness, we take the material kin of darkness, specifically ash*, and coax it into forming an immaterial aspect. By taking the examples of impish will and golem animus, we forge these into forms that resemble, in both form and function, birds of pure black. Their immaterial aspect spreads their animus across material separations, allowing them to almost instantly reform themselves from anything that doesn't either completely disperse their matter, too far for their immaterial aspect to spread, or attacks against their immaterial aspect, such as divine light. Further, they can spontaneously form beaks and talons of Dark Crystal, and constantly radiate an aura of darkness, invoking fear, doubt, and weakness in those they encounter, which can accumulate when they congregate in large numbers...
Something for the fire plane with a theme of being scary and difficult to defeat with conventional means, but somewhat lacking in direct firepower, what with them just being birds made of ash with a few small spikes. They should make for an effective support unit while being largely immune to fire and falling, which should make them effective at conquering the fire plane. They ought to be able to function in the water plane, but would likely be greatly troubled by being soggy. Still, soggy is better than extinguished which is what you would get from the typical fire minions...
*Ash being to fire what shadow is to light, the remnant of its absence. Shadow is a form of darkness, and fire is a form of light…
Hard, 2
Rationale: creating fire magic incorporeal ash golems, summoning natural weapons with magic, creating fear aura (dark magic spell).
2: The design has several flaws, but accomplishes its general purpose.
A truly revolutionary project in several aspects, the Ravens combine aspects from your imps, Bolter, and the Shadecrystal swords. The revolutionary aspect is not making golems with fire magic- they're similar enough that many of the mechanisms would be decently similar. The hard part is making them incorporeal. A bold move to be sure, but a surprisingly effective one - conventional weapons have almost no effect on the shadow-birds. Unfortunately, that is where the good news ends.
The experimental nature of the Ravens means that all the effort that would have gone to the other features simply didn't happen. The birds are incorporeal, and their form disperses and reforms as damage is received. They fly about as fast as a seagull, but if you were to dunk them in water, they would have a bad time.
The Shadecrystal claws were a decent project in of themselves, so you throw together some crafting magic real quick to allow the birds to have something. The birds can summon a few claws, but it takes them about a minute to do so, and they are tired out by the process, so they have to rest up a little bit. Luckily, once the claws are summoned they're set until the physical form is disrupted.
Regarding the curse, you managed to put one together, but it's not stellar, and only as good as a weak imp’s cackle. It functions much better in numbers, but currently single Ravens give off a vague sense of dread that can't be turned off.
They're also not very smart, and can't talk. They'll listen, though.
Contest Judgement after the rest of my homework.