Deus Ex: Mankind Divided gives you a unique opportunity to kill the boss Viktor Marchenko in different ways. Here's 5 decent ways of killing Marchenko (and disabling without much harm) including:
- manly face to face fight
- finding and using a killswitch
- hacking and taking control over robots and turrets
- sniping from above using tranquilizer rifle
- disabling Viktor's augmentations with subsequent hand to hand combat
The above-listed methods also include 2 non-lethal ways of disabling Marchenko (by tranquilizing Viktor and in hand-2-hand combat), which affects the ending.