The Back story: In the last adventure the party came across a worm that burrows through rock and devours really dense material that it can't burrow through, for example gems and rare metals and such. So our wizard decides that he is going to capture the creature by creating a spell to harden the rock while other party members distract it so that when it attempts to flee (via tunneling) the rock will be to hard for it to burrow through. (He already has a spell to remove the previous tunnels built into the room ("Stone Shape" a minor transformation spell)
The Problem: I'm trying to figure out what fits best as the powers basis. At first I thought it would be simply be Aid: Resistant PD Rock only however two problems came up as we were reading the book. First problem being how much or the room is being effected. For example you don't need a AoE to cast Aid on a giant to increase his strength so does that mean that the wizard can affect the entire room? That seems okay in this instance but I can see it getting abused rather easily such as a spell that Drains Resistant PD on a castle so that all the walls are as tough as paper. Seeing as a castle would be 1 target. However if Area of Effect is required it could affect multiple stone objects in it's area and the spell concept is more about one object (Wall, floor, excreta). The other issue is that Transform seems to be written to allow the alteration of items where Aid is written towards boosting a character. Now building the ability using transformation is fine, however it directly mentions under transformation that if you can do the same thing using a different ability then do so. There was also mention of just use barrier to create a new level of floor but that was denied rather quickly due to player preference (The character Transmutates things not summons them.)
Thank you for looking over my problem and any help would be appreciated.
