Then I use a surprise round of combat to cast Swarm of Crystals spending 7 pp to make it 7d4 damage, I rolled really well getting 25 damage, now it has a range of 15 feet, they're on the ground 20 feet below me, does gravity take the crystals and allow the spell to hit anyway? "Thousands of tiny crystal shards spray forth in an arc from your hand." Also the no save brought up a few questions.
This works, but not for the reason you think it does. Spells, powers, etc affect the area they say they affect and no more, gravity and inertia and the like don't help you at all. However, a cone-shaped spread effect starts in any corner of your space and widens as it goes. You, being a Medium creature, take up a 5-foot cube of space, which means if you're clinging to a ceiling 20' off the ground, the lowest corners of your space are only 15' up, and the spread effect can reach from the boundary of your space down to the floor. The power doesn't offer a save, but why should it? The damage is awful. You brought it up to 7d4 by paying for it as if it were a 4th-level power, and 7-28 slashing damage at a very short range, which may or may not be subject to damage reduction (more knowledgeable psifolk should know) is a pitiful thing to be blowing a 4th level spell or power on.
I declare that i am planning to cast it on the eagle druid to make it feel like it's having a heart attack (Having been lacerated by a bunch of crystals i'm merely changing the location of where the pain is felt). I was attempting to make the bird fall out of the sky and crash into the ground for some falling damage, and be unable to act for his next round
No. FSI is a trickery power, not an attack power. Even if you can provide the target with a sensation that indicates it's dying, it's not dying. The phantom heart attack has no functional effect, except whatever reaction the target chooses to have to such misleading information (including no reaction).
I'm not touching Energy Wall.