Wrath Series

The Wrath Series is the Curse Series which is unlocked by Naofumi after losing everything he valued to Melty and Aultcray Melromarc.

Overview
Ever since Naofumi was summoned, he was treated poorly by the royalty and The Church of the Three Heroes within Melromarc. He was called the "Devil of the Shield" and hated by even the common people - especially after being framed of rape by Melty. Despite being considered scum by everyone, he eventually found a trusted companion through Raphtalia. However, after "losing" the only thing he valued in this world in an unfair duel with Motoyasu, Naofumi fell into utter despair and unwittingly unlocked the Wrath Series. Naofumi first became aware of the Shield of Rage when he thought Filo was killed while fighting the Zombie Dragon. This became his most powerful shield by far and he continued to use it extensively in desperate situations. However, this shield also started to control Naofumi - the more powerful it got, the more difficult it was to control the overwhelming rage within. Fortunately, Naofumi's companions were able to keep him from running out of control with their compassion and even risked getting cursed for his sake. The Wrath Series shield got upgraded as more powerful dragon emperor cores got absorbed into the shield and as Naofumi experienced greater depths of anger until it reached Shield of Wrath IV.

The side-effects of the Wrath Series depends on what abilities are used. As a result of the Iron Maiden ability, all of Naofumi's SP was consumed. If Blood Sacrifice is used, Naofumi loses a dangerous amount of blood and receives a curse which reduces all stats except defence by 30%. Finally, the psychological curse from using the Wrath Series is that the user's personality twists so that they feel apathy and disdain for those around them.

Overcoming Wrath
Warning: Spoilers for anime up to Volume 15 ahead. During the fight against the Phoenix, Atla sacrificed herself in order to save Naofumi. Overwhelmed by Atla's incredible compassion, Naofumi unlocked the Blessed Series counterpart to the Shield of Wrath - the Shield of Compassion. The Shield of Compassion suppressed the Shield of Wrath and Naofumi was able to feel proper emotions. For the first time since his duel with Motoyasu, Naofumi was able to cry.

The Blessed Series weapon nullifies the curses of its counterpart Curse Series weapon and has dramatically increased abilities.

Volume 1
Naofumi is summoned as a Hero within Melromarc. However, he is treated differently by the king and The Church of the Three Heroes. Eventually, Malty joins his party and then accuses him of rape which strips him of all status and possessions. Later on, Naofumi buys Raphtalia as a slave. He treats her well and she becomes the only person he can trust.

After defeating the second wave at Riyute Village, King Aultcray and Malty notice that Naofumi is starting to recover from their mistreatment and manipulate Motoyasu (the Spear Hero) into duelling Naofumi in order to "free" Raphtalia. Naofumi is forced to agree and the two duel. Naofumi nearly wins despite having no attack power but then Malty interferes with the duel and Motoyasu wins. Raphtalia is "freed" from her slave curse and Naofumi falls into despair that he "lost" his only trusted companion. Due to his hatred for the world, the Wrath Series is unlocked. However, Raphtalia comes back to him and prevents Naofumi from falling out of control.

Volume 2
Naofumi, Raphtalia and Filo fight the Zombie Dragon until it looks like Filo got killed by the dragon. In his anger, he find the Shield of Rage within the curse series and uses the dangerous power to destroy the dragon. However, as he is nearly taken over by hatred, Raphtalia helps Naofumi get under control but is deeply cursed by the Shield's flames in the process. As a result, Naofumi decides to only use this extremely powerful but dangerous shield only when it is necessary.

Volume 3
During the third wave, the heroes face off against the powerful Soul Eater. Naofumi decides to use the Shield of Rage. However, he finds that it has been upgraded to the Shield of Rage II from absorbing the Zombie Dragon's dragon emperor core. When he used the shield, Naofumi's armor now changed to match the shield and the dragon's anger had been added to his own. With this upgraded shield, he used the Iron Maiden ability to destroy the Soul Eater. However, when Glass appeared, he tried to use it again on her but it was ineffective.

Volume 4
During the fight with the pope, Naofumi forced himself to explode with rage with upgraded his shield to the Shield of Wrath III. As a result, he was able to defend against the pope's powerful attacks. To defeat the pope, Naofumi used Blood Sacrifice which defeated the pope but nearly killed Naofumi in the process. The resulting curse of Blood Sacrifice is that all stats except for defence was reduced by 30%. It would take months for this curse to recover.

Volume 9
While in Glass' World, Naofumi had his equipment upgraded and used a new set of armor with a Demon Dragon Emperor's dragon core stone. With this, the Shield of Wrath III was upgraded to the Shield of Wrath IV. The wrath of the extremely powerful Demon Dragon was added to the shield which made it even more difficult to control. Thanks to interference from the Demon Dragon, Naofumi was also able to cast sacrifice-class aura magic which greatly increased the target's abilities in return for a curse which reduces their stats by 30%. Naofumi, Raphtalia and Filo were inflicted by this curse for a few months.

Volume 12
After upgrading his equipment again, Naofumi stored away the previous set which contained the Demon Dragon Emperor's dragon core stones. Unfortunately, Gaelion ate the dragon core stones and became possessed by the Demon Dragon Emperor which siphoned power from the Shield of Wrath. While the heroes fought against the Demon Dragon, it used power-up methods to improve itself through the Shield of Wrath. By the time it was defeated, the Shield of Wrath's rarity was increased to AF (artifact level) and a smelting level of +10 which makes it the most powered-up weapon which Naofumi has seen.

Volume 15
During the battle against the Phoenix, one of the special villagers of Naofumi's village sacrificed herself in order to save Naofumi and the rest of the forces. Through her compassion, Naofumi unlocked the Blessed Series Shield of Compassion which suppressed the curses and effects of the Shield of Wrath. As a result, Naofumi was able to feel proper emotions again and was able to empathize with others. This shield was also extremely powerful and overlapped its effects with other shields.