First things first, voting is closed. So the universe enforces contracts, people just learn how to make them.
Moving one.
I would say the goal is to contract for whatever services you need. If you can get a fire effect just as easily from any of those three entities it should be more about which on you'd rather deal with, which gave me an idea I'll go into below.
This makes me think of a middle eastern custom. Usually a merchant will offer gifts so people feel obligated to return the favor by purchasing something. I think something like this could be a good optional price for a bonus to the contract making check.
Diplomacy is my first thought, but skill modifiers can vary so widely and are too easy to minmax. So I'm thinking it should probably be based on class level like the binder's check. I'm imagining this as a magic system to replace vancian casting completely for the setting we're using it in, so I'd like to see the check based on level and then Int, Wis, or Cha based on the flavor of the particular class using it.
So far possible modifiers I'm thinking are things like:
- The number of contracts you're already in.
- If you've upheld previous contracts.
- If you've defaulted on previous contracts.
- Your alignment.
- What other entities you've contracted with.
- Stress at time of contract making. (combat or imminent doom)
So in some ways you'll kind of have a cosmic credit score to manage. I imagine making contracts should be a noncombat action, like a wizard preparing his spells. Bonuses or penalties for criticals have yet to be determined mostly because the base effects haven't really been figured out either, but I feel that their severity should be based on what else a primary contract making class can do. If they're 1/2 BAB and full of miserable saves, we should probably keep the penalty from being too much so it doesn't become russian roulette. The max number of contracts you can have active also depends on their strength, but I was thinking it should get harder to form new contracts while you are under others. Like each additional contract past a certain point would have add an increasing negative modifier to your contracting check. And I'm not sure if some contracts should be mutually exclusive or some suppliers should be mutually exclusive. Ie you could get fire and water both from some flavor of archon, but you can't get one from a demon and the other from an archon.
This is definitely a possibility, we haven't actually nailed down what the contracts should do.
Being able to put off they payment just gives a larger chance that the contract will be breached, and the penalty is probably in favor of the entity you made a deal with.(Like a credit card ) But here is the idea I got earlier the contract will be arrayed by type (most likely using cleric domains) and by level of effect. Multiple entities could all give you fire, war, or light, but each would want a different price. So I'm thinking the payments will be linked to the entity you are contracting with and the level of the effect instead of the domain of the effect. So there will probably be some chart making involved in this... but I feel like that's probably a better way to break this down. The other idea I've had is to leave some payments a little open to interpretation by the DM. Like if a demon would like you to kill some people, he may want you to burn them up if you bargain for fire. Thematic interpretation, I guess.
This is very much in line with what I was thinking.