One of my players has designed the following spell : teleport a massive amount of dirt (13x8x6m) from under the foot of an opponent 15 meters above him.
I consider the base effect 5 +1 (target:part), +2 (range:voice) and +2 (size) for a total of 30
The problem is, the spell is too effective : the guidline indicates that a size of 2 would be a +12 to the finess roll (which mean it will probably never fail), it inflicts +10 fall damage + the damage from the falling dirt (which should be probably quite hight at least +10) and bury the opponent, without any resist from parma or possibility to avoid it, unlike spell like Ominous Levitation of the Weighty Stone (Societas p.38) or The Earth split asunder (ReTe30) where it takes more than one round.
I know that lvl30 spell are powerful but here it's too reliable : no way to avoid it except by quickcasting or similar
I spoke with the player and he's very cooperative but I have no idea how to balance that. What is your opinion ?