Can you cast a fireball or gravity well or any other similar while blind by simply stating a direction and distance?
I have a problem with this if the answer is yes. Because based on what I have read fireball and gravity well just appear at the point you choose. There is no effect coming from you that would be blocked by a solid obstruction. Meaning you can just designate a fireball to explode on the other side of any opaque object. Line of effect for spells like these comes from the point of origin of the effect and not the caster.