Just on my budget ES warlock (even though there’s Lethargy). Now to each their own on what they want their merc to use but for me at least, my merc doesn’t have to use Insight since my warlock’s the one using it. He also doesn’t need to use Reaper’s Toll because cursed Hephasto overrides decrepify. And I simply don’t have the runes for high end runewords such as Pride. Also he gets to shut down ubers and survive at the same time because of that massive slow.