Item from Re:Zero by Tappei Nagatsuki
Fragments of the Witches of Sin's power — when absorbed, they grant Authorities that break reality's rules. Every Sin Archbishop carries one. Subaru is collecting them like the world's worst trading cards.
Witch Factors are the concentrated essence of sin given form. Originally belonging to the seven Witches of Sin — Pride, Greed, Sloth, Wrath, Gluttony, Lust, and Envy — these metaphysical fragments grant their wielders Authorities: supernatural abilities that operate outside the normal magic system and cannot be countered by conventional means. When a Witch died, her Factor didn't disappear. It found a new host. Usually the worst possible person. The Sin Archbishops of the Witch Cult each carry a Witch Factor, and their Authorities define them: Petelgeuse's Unseen Hands (Sloth), Regulus's Lion's Heart (Greed), Lye's memory consumption (Gluttony). When Subaru killed Petelgeuse, he absorbed the Sloth Factor and gained Invisible Providence — a weaker version of the Unseen Hand. He later absorbed the Greed Factor and awakened Cor Leonis. The implication is staggering: Subaru is accumulating Witch Factors, which is exactly what the Witch of Envy did four hundred years ago before she consumed half the world.
Also known as: Witch Factor, Witch Factors, Factors of Sin