Batman v Superman: Dawn of Justice

Zack Snyder directed Batman v Superman: Dawn of Justice.

The Knightfall storyline is significant in Batman's trust dynamics because it forces Bruce Wayne to rely on and ultimately trust others—particularly Jean-Paul Valley (Azrael) and Alfred Pennyworth—during his physical and psychological crisis, exposing the fragility of his solitary approach.

The provided sources do not contain any information about Lex Luthor creating Doomsday in Batman v Superman.

In DC Comics and its film adaptations, Lex Luthor typically serves as the primary antagonist who manipulates the Batman-Superman dynamic, exploiting their conflict over humanity's future to pursue his own agenda of control or destruction.

Lex Luthor manipulates public opinion against Superman in *Batman v Superman* by exploiting fear of his power, staging incidents to highlight collateral damage, and using media and political influence to frame him as a potential tyrant.

There is no documented evidence that Lex Luthor used any specific weapons against Batman.