<P> At a Congressional hearing, as Finch questions Superman on the validity of his actions, a bomb smuggled by Luthor goes off and kills everyone present but Superman . Believing he should have detected the bomb, and frustrated by his failure to save them, Superman goes into self - imposed exile . Batman breaks into LexCorp and steals the kryptonite . In preparation to battle Superman, he builds a powered exoskeleton, creates a kryptonite grenade launcher, and a kryptonite - tipped spear . Meanwhile, Luthor enters the Kryptonian ship and accesses a vast technology database accumulated from over 100,000 worlds . </P> <P> To bring Superman out of exile, Luthor kidnaps Lois and Martha Kent, Clark's adoptive mother . He reveals to Superman that he manipulated Superman and Batman by fueling their distrust for each other . Luthor demands that Superman kill Batman in exchange for Martha's life . Superman tries to explain the situation to Batman, but instead Batman attacks Superman and eventually subdues him with the aid of a kryptonite gas . Before Batman can kill Superman with the spear, Superman urges Batman to "save Martha", whose name is also shared with Bruce's late mother . Wayne's father echoed a similar sentiment just before dying . Realizing the fault in his plan, and being unwilling to let an innocent die, Batman ends his attack and the fight ends . He rescues Martha, while Superman confronts Luthor on a scout ship . </P> <P> Luthor executes his backup plan, unleashing a genetically engineered monster with DNA from both Zod's body and his own blood . Diana Prince arrives unexpectedly; revealing her metahuman nature, she joins forces with Batman and Superman to eliminate the creature . When they are all outmatched, Superman realizes its vulnerability to kryptonite, and retrieves the spear to kill it . In the creature's last moments, it kills Superman . </P> <P> Luthor is arrested and Batman confronts him in prison, warning Luthor that he will always be watching him . Luthor gloats that Superman's death has made the world vulnerable to powerful alien threats . A memorial is held for Superman in Metropolis . Clark is also declared dead, with various friends and family members including Bruce Wayne and Diana Prince attending his funeral in Smallville . Martha gives an envelope to Lois, which contains an engagement ring from Clark . After the funeral, Bruce expresses his regrets to Diana about how he failed Superman . He reveals to her that he plans to form a team of metahumans, starting with those from Luthor's files, to help protect the world in Superman's absence . After they leave, the dirt atop Clark's coffin levitates . </P>

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