So, I was thinking about how many maps have narrow paths over big falls or other dangers. Irl I would normally have a small fear debuff that inhibits my will to move, making it harder to commit to certain actions. For this, make it a resolve check or gain a debuff called "vertigo" that lowers your mp, dodge/evasion, and maybe melee skills while near precarious ledges. Or maybe just your agility and dexterity on their own.