Hi, I just got my deluxe edition copy and have been going through the book and there's one thing I'm a little unclear on. I understand the ability defence is basically like "HP" for that stat, but when you take ability damage from wounds/monster attacks does it also reduce your bonus?
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Yes this is an implied rule that's never actually spelled out anywhere so I put it on the new character sheets to avoid confusion. Ability bonuses are always ten less than their defence, so when the ability defence is depleted by wounds or attacks, the bonus reduces by the same amount. An ability defence of 09 or less will give you a negative modifier until it heals, and can lock you out of succeeding at some saves if it gets low enough.