If the game drags on, and there are no more killing roles left, the days can easily be spent in the "No Night, No Vote" phase, and at night, roles will target each other in such a way that, through a process of elimination, the murderer can be identified and then everyone will execute him. Even with his redirection and ultimate ability, Gollum won't be able to remain unknown forever.
But Shelob is a completely different story. So don't try to bribe people, Neyra.
Menti, do you think it makes sense to look for a clue if Sauron dies the next night?