When the Pandoran stops fighting me ... EDIT: and coming back at the end of the year

Praetorian Sirens are not present in lower levels, I checked.
Playing Legend you find Praetorian and Armis

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I also had Armis Sirens with Veteran difficulty in several missions, but no Praetorian Sirens in the last mission.

You could see a zombie Tobias West!!!