Your PCs have finally gotten the drop on their recurring antagonist and taken him down permanently. What now?
Other than “we party”?
Spoilers for Agents Of S.H.I.E.L.D. mid season three:
I would wait a week or two before bringing him back as a zombie, but hey. Some kind of revival or resurrection is fine in certain genres depending on Weird Level.
The enemy’s legacy can continue indirectly - he could have passed knowledge along to other agents, left contingency plans.
Does she have a clan ready to avenge her?
Would the PCs be charged with his murder - quite possibly rightly, knowing what PCs can be like? :D