Pick a living player and swap it with a dead player by night 3. If your pick survives until the very end, YOU WIN. Swapped player gets the living's identity. This will allow dead players to have a reason to stay to play again. Necromancers are neutral players. The person with a second chance has to finish the job. He will be like the disguiser by keeping the same name. He has an advantage if he knew who mafia was, however. So the necromancer if chosen right, can revive a mafia to a town position and effect the game greatly.