Dragongrief
Explorer
You couldn't Power Attack. Basically you either do or do not have Advantage/Disadvantage. Saying having them both "cancels them out" is a bit inaccurate - their effects cancel each other, but you still have the condition. It's why you can't stack advantage.OK so to be clear you're saying that if you're poisoned, attacking a prone foe, and power attacking it's a wash? I'm not disagreeing- I don't know what to think here
Poisoned - Disadvantage
Attacking a prone foe - Advantage
Net result - standard roll
You would still "have disadvantage", so you can't declare a powerful strike.