Did you try playing Crossworlds ? It`s interesting, and droid build is also available, but many other things but your choice anyway
As for target spell it`s random as all other things in this game, i played 1 time with no stone skin until Shetera, other game with no red dragons at all . . .
So before finding target keep stone skin/magic spring and if possible try using archamges for magic shield for medal, it will help you later in game.
Good luck