Beast Cores drop from Beast Born Demons near Mistfall Harbor at night. Find the demon groups, clear their spawn loop, and collect five cores for Serpent Breathing.

The Hashira are the strongest of the Demon Slayer Corps, but even they would be defeated by these 3 characters.

This article contains fan-fiction settings based on the content near the end of the original "Black Clover" series. Also, the "Coronzon" from this point forward is entirely my original ...