I'm liking what neogregory mentioned about a floating reaper teleporting around in the shadows to quickly ambush its prey.

On that note I imagined it pretty much not having legs and being able to slowly float around, the only kind of speed it has would be the quickness it strikes with its...claws?...once it gets the opportunity to strike.

As for the whole how does it feel about light, I figured it really wouldn't mind light but outside of shadow travel its top speed would be slow float.