this is a joke horror mod that adds a scary biome, where you have to kill scary creatures to collect scary souls to later craft into a boss altar and fight the boss. there is an ingot with good weapons that can take down most of the scary creatures.
scary biome
in the swamp i think also this is one of the scary mobs
aftermath of fighting the boss fills up your world with scary blocks! oh no
update will be explained in changelog and versions i think
i think i defeated the wrong entity