they might be out of blood buckets but they're not out of options.......yet.

Merlin is similarly intrigued by the Void, which may or may not be a pit of curses and malice. He summons his contracted Pixie and asks her if she can sense anything coming from there, basically just trying to see how she'll react. If she tries to wander off on her own to her own demise, he'll grab her back to safety.