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I know you found the keys. I need you to give them to me. All of them. I should've gotten rid of them right after it happened, right after my friends died.
~ Erin revealing her motives.
Time for you to go back to the Wellhouse, back where you came from!
~ Erin sadistically gloating to Dodge about abusing her.
Erin "Vossie" Voss is a former member of the Keepers of the Keys and a recurring antivillain in Locke & Key. In her youth, she fell in love with Rendell Locke and hence joined the Keepers of the Keys, but the group disbanded after Lucas Caravaggio was possessed by Dodge. Misfortune befell her when the housekeeper, Candice Whedon, found her using the Head Key. After over two decades in a catatonic state, Erin became hateful and endeavored to steal the keys from the Lockes, who had stolen them from Dodge, and destroy them, eradicating any traces of mystical power on the Earthly Plane. Several days after being freed by the Head Key, she eventually hunted down their rightful possessor and attempted to subject her to a fate worse than death by unleashing the Chain Key to drag her into the Wellhouse and make her cease to exist. But her nihilistic plans came to naught, and Eden Hawkins saved Dodge's life and allowed her to bring down Erin, saving her life and saving the keys from certain annihilation.
In her youth, Erin Voss fell in love with Rendell Locke and hence joined the Keepers of the Keys who watched over a series of magical keys, but the group disbanded after Lucas Caravaggio was possessed by Dodge. When the group split up all of the keys, Erin took the Head Key. She also witnessed Rendell placing the Omega Key into his own head.
Becoming trapped inside her own head
Two years later, a mishap befell her when the housekeeper, Candice Whedon, found her using the Head Key and accidentally absorbed it with her vacuum. She became severely mentally impaired and was admitted to McCellans' Psychiatric Hospital, where she remained for over two decades in a catatonic state. Rumors would circulate about what happened, and came to men such as Javi, who came to believe Keyhouse Manor itself could be cursed. When she was middle-aged, Erin was visited by Dodge, who trimmed her nails for her and informed her that Mark Cho and Rendell were both dead, reassuring her it was not her fault and she considered it bad news as well.
After Sam Lesser obtained the Head Key, Dodge used it to infiltrate Erin's mind intending to learn where her Omega Key was hidden. She was surprised when a second version of Erin did not appear, and proceeded to search through her memories. Just as she found what she needed, however, Erin's secondary, metaphysical form confronted Dodge who was amused to learn that Erin was not truly braindead after all. Dodge taunted Erin that she now knew where she and her friends hid her property and left Erin's head. Confused and enraged that the aperture was unlocked and Dodge would not hold the door for her, Erin banged on the door and made rambunctious and pathetic pleas to be escorted out, which Dodge understandably ignored as she made her leave via Anywhere Key. This turned out to be the right move on her enemy's part, because her mind was brought somewhat closer to the surface, with her awakening from her catatonia somewhat. Moments later, Erin was greeted by Kinsey Locke, one of Rendell's three children. Kinsey tried to question her about Dodge, but then Erin was able to cry Dodge's name and gestured for Kinsey to bring her the picture of the Keepers of the Keys, thereby allowing her to reveal Lucas Caravaggio and Dodge were (in a way) one and the same.
Much later, Tyler and Kinsey visited her and chose to set her free with the Head Key. Regaining her state of mind, Erin became determined to steal the keys from the Lockes, who had stolen them from Dodge, and destroy all of the magical relics. She chose to bide her time by helping her hosts in their attempt to restore the memories of Duncan Locke. When this was done, Kinsey brought news that Eden Hawkins was a demoness and that Gabe and Dodge were the same person, with Bode subsequently disclosing that Rufus Whedon had seen two Dodges' on the night of a fateful shadow attack. When the group realized it was Ellie Whedon who fell through the Black Door, Erin told them no one was to blame but Dodge, citing she was naught but intricate lies and masterful deceit. Duncan tried to convince her to begin trying to find her way in the world, but Erin's compulsive need for revenge was exacerbated by recent news and hence was not so easily sated, and she did not heed his advice.
Erin surmised that to destroy the keys, she would need to not only murder their rightful possessor, but vanish her from existence, a fate worse than death. To this end, she ruthlessly hunted her down while she was innocently attending a fair and unleashed the Chain Key to drag her into the Wellhouse, whose threshold would make her cease to exist. Ignoring Dodge's agonized and helpless screams, she gloated sadistically, completely shredding her harmless and conflicted facade in the process. Fortunately, Eden Hawkins saved Dodge's life by shoving Erin and releasing her mistress. Dodge righteously scorned Erin for her antics, to which she tried to appeal to Lucas to compromise Dodge's thoughts and help her. Amused by this, and knowing Erin would never stop seeking her obliteration, Dodge took a life for the very last time when she crushed her neck in self-defense, doubly saving the keys from certain annihilation.
In her postmortem, Erin Voss' corpse was buried by an eerie series of vines via Plant Key, removing the evidence from the grounds in which Winterfest was being held. Duncan arrived too late to interfere and it was all he could do to immoderately pity her with his tears as the threat of her meaningless malignance faded into the earth. Because her corpse was unavailable to her kin, they proceeded to burn Erin's belongings in lieu of a funeral. Duncan lied to Nina Locke about Erin's whereabouts, claiming that she departed for greener pastures without warning. Kinsey Locke would later use Erin receiving her comeuppance to further justify seeking to have Dodge inhumanely slaughtered, ultimately leading to her exorcism and her true fate becoming ambiguous.
Since spending over two decades in a catatonic state, Erin Voss grew a hateful personality in her comatose and became determined to steal the keys from the Lockes, who had stolen them from Dodge, and destroy them, eradicating any traces of mystical power on the Earthly Plane. When asking Tyler and Kinsey Locke to ensure Dodge left her alone until she was ready to strike against her, she disclosed her request rudely and abrasively, threatening them with a knife if they did not comply. Erin was a mean, bitter, destructive, vengeful, and black-hearted nihilist and harbored a strong and unprovoked hatred for Dodge, although she had never done anything to her. She also liked to gloat. When she immobilized Dodge, she boasted about how she alone was fully able to distinguish her from Gabe (despite everyone having recently learned the truth in that very affair) and joyfully states she was going to wipe her from existence, exemplifying her psychosis and sadism. While Erin was confident in her abilities to use the keys to abuse Dodge and destroy them once this use for them was fulfilled, this facade collapsed when faced with overwhelming force, which came in the form of Eden helping Dodge and Dodge fighting back in defense of herself and her keys. Completely terrified of her, Erin was too cowardly to own up to her inhuman assault when at her mercy and ultimately was only able to cry for Lucas Caravaggio's unfeasible intervention in her final moments.
Keyhouse Manor: Erin frequented this place as Rendell's girlfriend, and later resided there for a few weeks upon escaping her catatonic state.
While trapped inside of her head in Ray of F*ing Sunshine and The Head and the Heart, Erin's consciousness assumes the form of her younger self at the age she was at when she was first confined. In Past is Prologue, her mind assumes the form of Erin at her current age.