kaomera
Explorer
If you are rolling on a Prime attribute then the opponent gets a +12; if you are rolling non-Prime it jumps up to +18. That's the Challenge Base. Everything else being equal (and it never really is, is it?) you would have a 45% or 15% chance of success. But the 12/18 base assumes that an average PC will have a +1 advantage for ability score (since monsters / most NPCs don't have ability scores even a 13 would qualify, but the average score is 10.5...) and a +1 for level (I don't know exactly where that one comes from, since an equal-level challenge would be +X-X for a net "0"...), for a 55% / 25%. (Overall this is rather similar to the "Players Roll All The Dice option from the 3.5 UA here)Hairfoot said:Except success is more likely (and more predictable) since the opponent has no hope of getting a +20 bonus to its score, which may defeat a PC with a much higher base bonus.
Overall I'd say that the CK wants (/needs) to be calling for a lot fewer checks than a 3.5 DM. That or applying a lot of negative CL, for a more reasonable final CC... My understanding is that anything reasonable should just e allowed, only roll when the player wants their character to try something "interesting"...