Heightening just -is- putting it in a higher level slot.
Certain spells have special effects when put in a higher level spell slot, but that doesn't mean spells without those special effects can't be heightened.
So just to be clear, if my 4th level sorcerer knew true strike, magic missile, burning hands, and fear as 1st level spells, had magic missile and burning hands as my "spontaneous" heightened spells, and had already used all of my 1st level spell slots while still having 2nd level slots available, I would not be able to cast true strike with the 2nd level slot, even though the effect would be the same regardless of what level slot it was cast in, correct?
No, you could since you chose them as your spontaneous heightening spells and as such it lets you cast them as 2nd level spells.
No, you could since you chose them as your spontaneous heightening spells and as such it lets you cast them as 2nd level spells.
No, in this example burning hands and magic missile are the "spontaneous" heightened spells, true strike, since it doesn't heighten, was not one of the two. In this case, would I be able to cast true strike using a higher level spell slot? If not, then that makes the reduction of spell slots for spontaneous casters even more restricting than it already is.
