I tried but I'm pretty sure I messed up because the game crashes when I approach nightingale in. This is primarily just for show but several have enemies to fight as well so you can use them to acquire some of the harder to find Daedric ingredients.
If you ask him how extra jobs will help the Guild, he will reply with: 'Years ago, the Guild used to have a foothold in every major city in Skyrim. The best weapon in skyrim without mods is… Any weapon. For followers that are available in the Dragonborn expansion, see this article.
Skyrim is one of the most modded games of all time, with over 60,000 submissions on Nexus Mods and 28,000 in the Steam Workshop.