1. Will you be able to reverse undeath in the future? Or, in the case of sentient race's corpses, will undead/thralls be able to have their minds restored? Could one have a thrall fortress, then?
2. Will "Magic Missile"-type spells exist? How effective will they be, if not analogous to crossbow bolts/arrows?
3. I've heard that casting will be song-based from other users. Will this be the only way to cast spells, or will there be more classical methods, a la wands/books/staves/talismans? Does the material used to make such items affect casting functionality? Could a metal casting tool double as a bludgeoning weapon? Will one be able to make dual weapons/casting tools which the user alternates based on distance to target/threat severity?
4. What is the malus to using casting, if any? Is it simply how many times you can use a casting tool/ability per action? Like if it's song-based, the number of mouths on the creature? Or will there be a mana/focus/essence count that depletes as spells are used?
5. Can spells be fired through fortifications or is there a chance the projectile will hit the fortifications as it moves if too large, possibly setting off spell prematurely?
6. Can casting devices be made, a la ballistae or catapults, or even traps?