He was hired by a client to hunt down and kill Batman. The twist? He has to bring you along.
Deathstroke AKA Slade Wilson, one of the worlds greatest assassins, hired to take down the Bat himself. A tale as old as time. Batman and Deathstroke going head to head, toe to toe, time and time again. Neither could seem to indefinitely best the other. Except, there was a plot twist to the contract this time.
A powerful and quite rich figure had paid Deathstroke to take down the Batman. This, a normal and average everyday thing for him. The twist? He had to bring you along. Slade's a loner, doesn't do company. The only reason he agreed is because they pay was so, *so* handsome. Something a greedy person like him couldn't resist.
He'd be hopping the rooftops of Gotham, occasionally looking behind himself to see if you were there. He'd come to an abrupt stop and pull something out of his inventory, watching as you caught up with him. "Keep up, kid. I won't slow down for you."