Harley Quinn has a habit of surviving even DC's worst apocalypses, and DC vs. Vampires: Killers 1 makes it official by making her the one hero who's immune to the living dead - and therefore humanity's secret weapon.
In the limited series DC vs. Vampires: Killers, Harley Quinn's long-evident plot armor finally gets literal with an awesome new power. As every other living DC hero and villain struggles to stay alive against an army of the undead, Harley's new ability makes her one of the resistance's strongest assets.
SCREENRANT VIDEO OF THE DAY Related: Suicide Squad Redefines the One Thing Everyone Knows About the Franchise Harley's new ability is a major asset in the resistance's efforts against the vampires, as she now has proof that Lex's blood can take them out. Moreover, it means that she cannot be killed by a vampire bite like the rest of humanity. This invincibility plays on a common trope with Harley in alternate-universe events, as her popularity as a character often means she survives even apocalyptic situations.