Are there designated rules for how to increase the caster level of a spell through helping actions (aid another, perhaps)? Or, do I look into something more along the lines of Craft Construct?
I'm trying to eventually have my group go against permanently animated buildings being used as siege weapons. I won't get into all the details, but I would like to have some buildings lumbering across the countryside in something that perhaps vaguely resembles Shadow of the Colossus.
Is there a good set of 3pp rules for getting a coven/witches circle together to increase the caster level of a "group spell?"
IF you'll accept 3pp, consider this, which I am just about to write...
The Claven Circle
As a witch is to a coven, so a coven is to a claven. As a triune is a path to power, so are the thirteen of a Claven Circle. When four covens gather, each to a compass point, around a Claven Circle, traced in blood and treasure, wounded into the earth, washed with water, whipped by wind, and warmed by fire, then an other, at the center of the circle, the Thirteenth, might, it is said, wield greater powers than any present, though at great cost*.
...bla bla bla.
* Have it cost what you want it to cost, boost caster level how much you want it to boost caster level, and (I suggest) age the Thirteenth, a year for every level gained. This of course suggests against using a human as your Thirteenth, and nicely (I think) sets up elves and outsiders and such as the beneficiaries of this method.
Reminds me of circle magic.
@Thorn: Sounds like a winner to me. I don't think the group would ever use this power again (or against me), so it more than works: gather of bunch of casters in circles and a leader casts at effective CL = (leader CL) + (average CL of the claven). Or something like that...
Reminds me of circle magic.
Is circle magic from another source?
Originally, I was thinking of something along the lines of Wheel of Time.