magic_gathering2001 said:
jdrakeh: Right its skill based but how does one determine the DCs
Common sense in Core Elements (an Easy DC is 5, Near Impossible is 30, and Average is 10 - per the SRD). It's really designed for people who posssess a working knowledge of d20. That said, Strange Aeons contains rules for assigning DCs based on whether the character is casting spells from memory or from a written text. The rules for DCs associated with casting from memory can be easily applied to spontaneous spell casting, as well.
Alternately, (an excerpt from something that I'm working on for my personal use)...
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Assigning a Difficulty Class
For saving throws or character actions that are not being actively opposed by another character or creature, you’ll need to assign a difficulty class (DC) ranging from 5 (easy) to 30 (near impossible) based on your best judgement. When a character is attempting to perform an action that is being actively opposed by an opponent, the player of the opposing character or creature makes a check and the result of that check serves as the DC.
Assigning Situational Modifiers
Situational modifiers are simply negative or positive die roll modifiers that you may stipulate a given player add or subtract from the result of a check they have made, based upon environmental factors or other such variables that may have a direct bearing upon an action being attempted. For instance, a you may assign a -8 situational modifier to a character’s attempt to scale a steep cliff face during the middle of a raging ice storm using nothing but their bare hands. Similarly, you may wish to assign a +5 situational modifier to a character attempting to climb the same cliff during the summer, in good weather, with a full compliment of proper equipment.
Ultimately, the situational modifier is a tool that gives you the ability to further adjust the difficulty of performing a given task in games of Hail & Kill based upon variables specific to the situation at hand.
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Even here, though, the hard and fast rule about DCs and Situational Modifiers is 'use you best judgement' - much as it is in any game that utilizes sliding difficulties. Trust in your ability to assess a situation and assign an appropriate DC to it.