I have spent the past 4 days unlocking this. I've killed 4 witches after overthrow. Done the over throw 9 times and still have yet to get the next step. It's to the point I'm close to just uninstalling.
English
#Help
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All 3 Overthrow completions + 3 wizard kills + orb dunking has to be done in a single instance or you start over. If you clear 2 overthrows, kill their wizards, and then go to orbit/go do strikes or something then you start over from the first Overthrow again with no wizards counting as killed.