One of my players, the one playing the Verditius magus and the companion knight, wanted to start out with a spell that he initially thought would cinrcumvent Parma Magica. Essentially he wants to have a spell that creates a massive boulder above the targets head and then crushes the target. I explained that spells either have to penetrate or you have to aim them with the Finesse ability. Then I figured that if you create something, it is either magical and has a duration and thus Parma protects or alternatively you have to create it with a ritual spell which is inconvenient in combat.
The player found a spell from somewhere in the internet, but I'm left with the task of directing the adjucation of this spell. Nowhere in the books can I find examples or guidelines dealing with this.
Level 10 spell: CrTe base 3 (stone), +1 diameter, +2 voice
Now, it strikes me that creating a stone in mid-air is either something that is unnatural for the stone so that would mean either +1 magnitude for the unnaturalness or perhaps an Auram requisite, because you are creating the stone in air. The first option seems more suitable.
Level 15 spell; CrTe base 3 (stone), +1 diameter, +2 voice, +1 unnatural property
Level 10 spell: CrTe(Au) base 3 (stone), +1 diameter, +2 voice, +0 Auram requisite
Or perhaps you'd need an Intellego requisite to target the "empty" air above the target or something. Still, I feel that you'd have to aim. All in all, I feel that this is (I hesitate to use the term) a bit out of paradigm. Stone is solid. I hesitate to make rulings that would lead to magi dropping conjured towers at each other. Water flows, flames spout and air breezes, but rocks sit.
In Houses of Hermes: Societates page 35 we have a shaft of ice that is launched against a target. It always hits, but I guess that because ice is not naturally something that moves at a high speed towards something, it has an +1 Rego requisite. That spell has a momentary duration, but then again, it is launched against the target at high speeds.
Level 10 spell; Cr(Re)Te base 3 (stone), +0 momentary, +2 voice, +1 Rego requisite
The individual target for Terram/Stone is "For stone, it is a single cubic pace." How much would this do damage?
Could you guys offer any sage advice on how to deal with this can of worms? I do know that in the end we will resolve this among the troupe, but I'd like your insights on how would you handle this in your tables.