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Message: <blockquote data-quote="RangerWickett" data-source="post: 2922684" data-attributes="member: 63">When you attack with a sword, your attack roll must beat your foe's AC. When you try to open a lock, you must beat the DC of the lock. True, sometimes there are opposed rolls, like when you're picking someone's pocket, but I wonder why d20 can't just go to flat resistances.Instead of Fort being a roll you make in response to a spell, your Fort is 10 + class-based bonuses + Con + miscellaneous. Whenever a wizard casts a Fort save spell against you, he would roll d20 + Intelligence + spell level, and if he beats your Fort, you're affected.Why wouldn't this work? Is there something about rolling to resist effects that is better than having the attacker make all the rolls?Of course, I don't know what would happen in such a system when a person is trying to avoid heat stroke. There's no attacker to try to beat his Fortitude, so what would happen? I'm just curious about potential variant designs for game systems.</blockquote>