Oh never mind, I think I got my answer on the v4 character sheet lol.

"Ability bonus is always 10 less than the defence.

The bonus can be negative."

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?