The Mawsworn's torturers have a talent for misery.
The suffering they inflict often produces more Stygia than they can collect. The excess floats loosely in the air, left to drift into the abyss.
I have fashioned a conduit specifically for capturing the leftover Stygia. You can borrow it if you wish.
There are a handful of prime gathering locations throughout Calcis. As you'll be using my conduits, we can split what you find upon your return.