Any world he wanted, Steppenwolf has been able to take. The reason for his success for so long is mainly due to how strong he is as a fighter and the army by committee system he possesses. When these demons of Apokolips keep coming, it takes all one can do
just to get them out of the way enough to get to Steppenwolf. When finally approached, he is not some pushover.
He posses a cable-snare weapon that allows him to entrap opponents. While in this, he can fire lethal radion beams at someone. His main weapon is his electro-axe, the thing you see him with in the film. He is a master swordsman and a formidable hand-to-hand combatant, meaning even the best like Batman would have a tough time taking him on even without his weapons. It is also tough to ignore that he is immortal as well, and has super-strength and speed. That said, we're not seeing some sort of easy opponent. The league is nearly crippled by this man, and for clear reasons. With that known, Steppenwolf clearly deserved to be on this list.