Tried to mod 2 new spells without success -
So here are my ideas that hopefully someone will like and mod
Cone of Cold - FE has fireball and lightning bolt, but to my knowedge doesn't have cone of cold. I think this would be a good fit. It should have similar range to fireball, but a smaller area of effect (as much as a cone might have relative to a fireball, and the max damage should be about 2/3 of a fireball, but if the target resists, it is slowed for 1 turn.
Disintegrate - A very high level death spell that would either cause the victim to lose half their hit point if they resist, or all of their hit points if they fail to resist. The area of effect would be a single individual, and it could only be cast once per battle, and have a very high manna cost.