After receiving a near-fatal injury in the previous episode Weiss Schnee managed to survive in RWBY volume 5 episode 12 – here’s how. Rooster Teeth’s anime-style show is focused on four main protagonists: Ruby Rose, Weiss Schnee, Blake Belladonna and Ruby’s younger half-sister Yang Xiao Long. Together they form Team RWBY, a group of huntresses that battle the various evil forces that plague Remnant – the futuristic fantasy world that RWBY is set in.
In volume 5, Team RWBY fought one of their most important battles to date: the Battle of Haven. The battle took place at the Haven Academy in the kingdom of Mistral and saw several RWBY villains including Cinder Fall, Salem, the White Fang terrorist group and Yang’s mother Raven Branwen storm the place in search of a powerful relic that is kept stored in its vaults. During the battle, Cinder Fall is fighting Jaune Arc who gets the better of her. An enraged Cinder gets back at him by conjuring a spear and impaling Weiss, gravely injuring her.
Titled “Vault Of The Spring Maiden,” RWBY volume 5 episode 12 sees Weiss on the verge of death as Jaune and Lie Ren desperately try to save her life. Just as it seems all hope is lost for Weiss, Jaune places his hands over her wound. This helps Weiss’ Aura - which, in RWBY lore, is a protective armor of sorts with healing powers - heal her fatal injury.
Unbeknownst to Jaune, he unlocked his Semblance in RWBY volume 5 episode 12 while trying to save Weiss’ life. In the weird and wonderful world of RWBY, a Semblance is the tangible projection of an Aura and is kind of like a superpower. Semblances vary from person to person – for example, Ruby Rose’s Semblance gives her the ability to move at incredible speeds, while Blake Belladonna’s Semblance gives her the power to create clones of herself. Jaune’s Semblance is Aura Amp which – as its name suggests – gives him the ability to amplify his own and others’ Auras thanks to him having unusually high Aura reserves.
By the time the next episode of RWBY, “Downfall,” rolls around Jaune has used his Aura Amp to restore Weiss’ depleted Aura reserves which in turn allows her once fatal wound to be fully healed. Thanks to Jaune’s Semblance, Weiss escaped certain death and was able to re-join her friends in the Battle of Haven, because the team will need all the help they can get to win the day.