Again, what that is hasn’t been revealed yet, although considering that the Snyder Cut will also include Jared Leto’s Joker, perhaps we’ll be taking a trip to Arkham Asylum and seeing Deathstroke break Lex Luthor out of the facility.
As such, Zack Snyder’s Justice League will be our second and possibly final time seeing Joe Manganiello’s Deathstroke, and luckily for Joe Manganiello, it sounds like the character has a little more to do this time around.
It’s also been speculated that Deathstroke might be part of a new vision of the Knightmare future that was briefly shown in Batman v Superman: Dawn of Justice.