It drives me CRAZY though that you can't kill Maven. After you finish the Civil War you can hunt down and kill the formerly-immortal Legates, but even after clearing the Thieves' Guild quests, Maven remains immortal?

How I feel whenever I enter a new dungeon.

"Hey, conjurer! Teehee, why don't you... pffft... conjure me up a... heeheeha... nice... snicker... warm... bed. Bwhahahaaaa!"

I am a hater but I'm not the only one.