It depends on
SPOILER ALERT. Click here to see text.
how useful liquid darkness is, as my guess is that they are coated with liquid darkness in a matter similar to daggers of venom, but it is just a guess.
Not to mention the mundane issue of weapon proficiency - axes are rather boring in terms of magical effects and artifacts, compared to many other things, so it's unlikely you'll be skilled in axes by the time you get them.