The Rising of the Shield Hero is a dark fantasy isekai anime that keeps upping the ante with new villains, new monsters, and even intimidating new weapons for its protagonists. The four Cardinal Heroes are summoned from 21st-century Japan to save the Kingdom of Melromarc from doom. However, if they are not careful with tools like the Curse Series weapons, then Naofumi, Ren, Motoyasu, and Itsuki are liable to become the kingdom's worst enemies of all.
Source：https://www.cbr.com/rising-of-the-shield-hero-curse-series-weapons-explained/
