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After I died something like 25 times yesterday evening trying to defeat the Sphinx I think there should be some adjustment. None of the tactics described above worked for me. Neither staying covered behind the first wall until the Sphinx starts levitating or simply using the old Doom tactic and never stop moving :-)

When I watch this Youtube video it becomes obvious to me that I seem to have invested in the wrong weapon updates and perks ?

The guy kills all the enemies without issues.

Unless someone gives me a hint or difficulty is a bit adjusted this is the end of my Project Warlock travel ;-(
Really a pitty since the game was a lot of fun so far......