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It’s a pleasure to meet you. No, perhaps I should say we’ve met many times before? I am Medea Pideth Machina. You are the ones who put one of my fragments, Malty, through quite an uncomfortable time, are you not?
~ Medea to Trash and the Heroes

Medea Pideth Machina is the overarching antagonist of The Rising of the Shield Hero series and the true mastermind of the Waves, the darkness of Melromarc and the world it belonged, and the vile actions of the Reincarnators, being the root and cause of all evil in the series.

In the later part of the Web Novel, it was revealed that Princess Malty S. Melromarc, the series' main antagonist at the time, was a soul fragment to Medea, alongside other villains post-Melromarc, who were more or less connected to her somehow. She is the archenemy of Glass and L'Arc, and later the ultimate enemy of all heroes in the story once her existence was revealed. Medea is a goddess born as a human since ancient times whose goal is to unite the Eight Worlds and then descend into the fused world to devour its energy and cause the suffering and pain of all of its living beings. Once she is done with the eight worlds, she is presumably to do the same thing again elsewhere.


Medea is a goddess whose goal is to unite the eight worlds which comprise the Heroes World, which has been reduced to two or four by the time the story takes place and then descends into the fused world to devour its energy and move on, presumably to do the same thing again elsewhere.

She had yet made an appearance in the light novel series, which was adapted from the original light novels, but her existence was already alluded in the recent stories and was referred to as a deity/god that was the mastermind of the Waves.



With her past being vague to tell, all we know about Medea is that once she was a citizen of an ancient civilization, who somehow managed to gain immortality and God-like powers. At an unspecific point in time, she approached the Heroes' Worlds and started fusing all eight of them into a single world so she could enter and absorb it.

All the time, she used her powers to reincarnate and brainwash several individuals into all of the eight worlds, in order to sabotage the efforts of the heroes who oppose her while also incarnating her own fragments in positions of authority in said worlds to regulate the process.

Medea was fully aware of her fragments' experience (including Princess Malty S. Melromarc) in other worlds and shared their memory and personality as a result. The humiliation against Malty (although it was a just desert for her) was one of the catalysts that caused Medea to begin to target Naofumi, as she saw him as her greatest thorn in the side.

Besides from being the cause of the Waves, Medea was also the mistress of Naofumi's later foes like Kyo Ethnina, Tact Arusahorun Faubley, and other Reincarnators across other worlds. The Reincarnators were forbidden from speaking out Medea's name to their enemies. Once they were about to reveal, they would literally explode violently and die, and their hand-written confession and testimony would become too blurry to read.


Much like her fragments which work to sabotage the heroes and ensure her Waves of World Fusion go uninterrupted, Medea is nothing more or better than a rotten, hateful, selfish and remorseless God Wannabe in the core, believing human is just her tools for her to manipulate and admitting everything she did was all for pure enjoyment. She has no attempt at repentance over everything she did. Instead, she boasted her atrocities proudly and had no regards over anyone she trampled underfoot, including Naofumi and later Glass.

Besides, Medea is just as manipulative and deceitful than her fragmental counterpart, Malty, if not even worse. She and her fragments throughout the alternate worlds managed to convince many Reincarnators that she's "good" while sowing discord and death. Her rousing act was so convincing and seductive that the Reincarnators still chose to follow her even when she was perpetrating horrific atrocities right in front of them, and confessing to many other crimes. On the other hand, the fanatic Reincarnators that followed Medea always believed she was the epitome of righteousness.

One of her crueler tactics was to bring back the soul of a deceased enemy (most notably Queen Mirellia Q. Melromarc and Elrasla Grilaroc) and send it to their former allies, claiming to have survived their apparent death. After fighting on their side for a short time, the soul will take advantage of an opening to betray them. After the death of Malty (in the web story), Medea held a firm hatred against Naofumi and his friends for causing setbacks in her overall plans, so she finally decided to reveal herself.

In the end, Medea revealed her plans to extinguish all life in the universe one world at a time simply to boost her power level. Before her defeat, Medea suffered from her deflated ego and flew into a rage when beaten and simply trying to take down millions with her. However, this was fortunately prevented as she dies at the hand of Naofumi, who became a God himself and erased everything about Medea from existence, bringing back everyone she controlled as her undead minions.

Ultimately, Medea is nothing more than a self-proclaimed sadist, who committed her crimes for nothing except greater power, and she always commits atrocities with glee and pride. The villains from the other stories shared her personality since they were either her incarnations or the same kind of repulsive people she is fond of.


  • In Web Novel stories, Medea's existence was only revealed at the beginning of the Final Arc. However, in the Light Novel series, her existence has alluded already after the Spirit Tortoise Arc, which had a lot of original contents deviated from the web story.
    • The author also confirmed in their words written by the end of Light Novel Volume 19 that Medea (unnamed at the time in Light Novels to prevent spoilers from Web Novels) had more powerful minions to go after Tact, serving as her main generals.
    • While Medea and Malty were revealed to be the same entity in the Web Novels, the Light Novel continuity diverges from this revelation and establishes that they are separate individuals.
  • Medea was named after a famous figure in Greek mythology.

External Links


           Shield Hero Logo.png Villains

Melromarc Kingdom
Malty S. Melromarc | High Priest Balamus | Aultcray Melromarc XXXII | Idol Rabier

Glass' World
Glass | L'Arc Berg | Therese Alexanderite | Kyo Ethnina | Miyaji Hidemasa

Legendary Heroes
Ren Amaki | Itsuki Kawasumi | Motoyasu Kitamura

Former Companions
Welst | Mald | Lesty

Medea's Reincarnators & Vanguards of the Waves
Medea Pideth Machina/Malty S. Melromarc | Tact Arusahorun Faubley | Kyo Ethnina | Trash #2 | Miyaji Hidemasa | Seya

Heavenly Emperor of Q'ten Lo | Jaralis | King of Faubley

Melromarc Kingdom | Vanguards of the Waves | Siltvelt | Church of the Three Heroes | Faubley