Dark Aura

Well if that's the case, it's still a % base buff. I would assume Rage and Mediation would still stack. The best example I can think of is a Buccaneer transforming with Maple Warrior on. The STR buff Transform gives isn't replaced by the STR% buff of Maple Warrior and vise versa, right? If that's the case, then weapon attack should be the exact same.

Yeah, it's a % buff, so it works with matk pots, as far as I know.

Also, checking with a physical classes to see if it's different for them. They did add Dark Aura when INT and Magic Attack were added together to get Magic, so it might be different.

11atk Claw + 15atk Stars + 3 Blessing

 Without Dark Aura

 With Dark Aura

It definitely looks like it's % atk/matk rather than % damage, and it stacks with pots.

 With Dark Aura and 5atk Pot