The Batman Who Laughs exposed Superman and his son to Black Kryptonite and watched them both devour Lois Lane to quench their insatiable hunger. It induces a violent rage in his mind and sends him on a feeding frenzy. Black Kryptonite is particularly harmful to Superman. One of the weapons stored within that vault was a stock of Black Kryptonite. They stored these weapons inside a secure vault. Over the years, the Justice League had collected several incredible weapons as spoils of war. Another female Batman with powers of Aquaman and a Batman who became the equivalent of Cyborg only stronger, were also part of the team. The Dark Batmen included a Batman who became Doomsday called Devastator, a Batman who became the God of War, and a Batman who absorbed Barry Allen and became the Red Death. Before the events of Dark Nights: Metal, The Batman Who Laughs traveled to multiple dark universes, recruiting some very potent and powerful Dark Batmen called the Dark Nights for the upcoming invasion of Earth Prime. The Dark Multi-Verse housed infinite number of alternate universes that were doomed from the very beginning. It brought out the victims’ deepest and darkest desires. The joker toxin used was different than the one used on TBWL. Dark Shazam proved incredibly powerful, able to take on Superman and defeat him in a one on one match. Superheroes like the Blue Beetle, Super Girl, Hawk Man, and Shazam became darker versions of their original selves. When The Batman Who Laughs came to invade Earth, he used the same Joker Toxin to infect some powerful DC Heroes. At the time of his death, the Joker toxin was released and it infected Batman’s mind, making him the Batman Who Laughs. To infect the mighty Batman of his universe, Joker of Earth -22 created a stronger version of his Joker Toxin. The death of the entire Bat Family was the beginning of the end for Bruce Wayne. Coincidentally, they are also the first people to be killed by his hands. This act was even more savage considering the fact that the Batman has no real family but considers Nightwing, Red Hood, Robin, and the Bat Girl to be the ones closest to him. One of the first acts of The Batman Who Laughs after completely giving into the Joker Toxin induced insanity was kill each and every member of the Bat Family.