taskmaster

task +‎ master

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taskmaster (plural taskmasters)

1. Someone who supervises workers, especially one who imposes hard or burdensome work.
   • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Exodus 3:7:

     And the Lord said, I have surely seen the affliction of my people which are in Egypt, and have heard their cry by reason of their taskmasters; for I know their sorrows

2. (figuratively) A source of hard work or responsibility.
   • 2023 June 4, Charles Hugh Smith, What Happens When the Competent Opt Out?‎:

     It all looked so easy when the competent were at the helm, but reality is a cruel taskmaster, and all the excuses that worked as an underling wear thin once the incompetent are in leadership roles.