The Firestorms talked for a bit and negotiated the 'contract'; it kept all the power in Firestorm's hands and use but Dark was still kept on a leash of sorts considering the guy's history.
"That seems in order. I should let you know that one we are done talking, your Knight friends will sense my presence and will take action...likely involving a Cortical Psychic Patch." Dark said after looking over the 'contract' and signing it.
Firestorm nods, "Now, I think you need to head off to your little corner and stay there."
"Okay, but I will drop in to chat and give you a reality check now and then." Dark said before vanishing.
Firestorm was left alone and sat at his desk to ponder over what just happened.
(@Chromeharpoon) the Knights, especially the ones that Firestorm helped keep alive in The Pit when they encountered Devil Gigatron the first time, sensed something familiar yet not; some kind of darkness they encountered before but it had some light within it as well.