Piero Joplin

"He is Piero Joplin. Even now he visualizes the next invention - astonishing. I wish you could see it too."

- The Heart

Piero Joplin is a natural philosopher, an inventor (whose creations include an anti-plague potion known as Piero's Spiritual Remedy, Corvo's Mask, and later, an advanced Arc Pylon) and a member of the Loyalist Conspiracy who resides above the workshop at the Hound Pits Pub. Throughout Dishonored, Piero supplies Corvo Attano with ammunition and equipment upgrades, provided Corvo has the required coin to purchase them. He also designs and constructs Corvo's mask, which he gives to Corvo upon their introduction.

Biography
Piero is the youngest person ever to graduate from the Academy of Natural Philosophy, which irritated the Head of the Academy, Anton Sokolov. At an indeterminate time prior to the events of Dishonored, Sokolov played a part in expelling Piero from the Academy, creating a fierce rivalry between the two. Piero believes that if it weren't for Sokolov, he would be a Senior Fellow at the Academy. He also suggests that Sokolov stole several of his inventions, including his elixir formula.

Before creating Corvo's mask, Piero was visited by dreams of a boy dying. The dreams distracted him, making his work impossible. He then began dreaming of the Void, where he encountered what he believed to be death. Inspired by his dream of the Outsider, he began work on the mask that would later be presented to Corvo. Before completing the mask, Piero also created Corvo's crossbow and sword, which Corvo acquires in the sewers.

According to the Heart, the Outsider continues to visit Piero at night, giving him ideas for new creations in his dreams. An audiograph found on Piero's desk suggests that the Heart itself is one of these creations.

Piero and Sokolov ultimately reconcile their differences while under siege from Farley Havelock's men. In the low chaos ending of Dishonored, the two combine their efforts and develop a cure for the rat plague.

Trivia

 * Piero is voiced by Brad Dourif.
 * Piero provides Corvo's primary source of income, selling items that Corvo collects during his missions. In terms of gameplay, this is expressed by Corvo's funds increasing when he collects loot.
 * According to this note, it is possible for Piero to use some of the items that Corvo collects, such as copper wire.
 * Piero can be found spying on Callista Curnow in the bath, and has done so many times, according to the Heart.
 * If Piero is caught spying on Callista by Corvo, he will attempt to excuse himself, saying that he was working on a "Snowflake Lock".
 * Piero can also be overheard attempting to flirt with Callista by mentioning "devices" he designed for the Golden Cat. She responds with disgust.
 * At one point, Cecelia expresses an interest in marrying Piero.
 * Piero suffers from "brain fevers" that even his own elixir cannot cure.
 * The term "brain fevers" refers to an outdated medical term that was used to describe symptoms of encephalitis and/or meningitis.
 * Early promotional materials for the game show Wallace Higgins working in Piero's workshop; Harvey Smith confirmed in a tweet that Piero and Wallace's head models were switched at some point between the making of the promotional materials and the release of the game.
 * The concept art featured in the gallery below shows Piero wearing Wallace's clothes.
 * If Corvo kills or does not rescue Piero and Sokolov during a low chaos playthrough, the ending will show their abandoned laboratory being overrun by the plague, even though the Outsider's narration still states that the plague was cured.
 * During his time at the Academy, Piero once settled an argument with William Trimble by winning a coin toss.
 * According to Harvey Smith on Piero's life after Dishonored, "[I] always assume [P]iero is perpetually bitter and alone, self sabotaging".
 * Piero joined back the Academy of Natural Philosophy in his later years to teach alongside Sokolov. Alexandria Hypatia was one of his students.
 * Ultimately, sometime between 1837 and 1852, Piero produced a new health elixir with Anton Sokolov, known as the S&J Health Elixir, before passing away.