NOTE* it's just an imaginary with help and inspiration from Christianity.

When a person do lots bad work that person becomes a sinner.
A sinner get punished in the hell it doesn't matter what were your intentions behind your sin you are a sinner.
The most bad sinner become Grim reaper as a punishment from God and for help to God of Hell to collect sinners .
It's hard to tell one name of God of Hell ,according to HEBREW BIBLE "Sheol" and about New Testament it's "Hades" .
Human who committed suicide become Grim Reaper as punishment.
Grim...