This is a souls-like datapack. it added many new weapons and items from ds3 (mainly pvp) and some weapons from elden ring. The datapack also includes a new boss Nep.elder with many skills, the details and crafting recipes could be found in README file, the weapons are quite meta in vanilla minecraft so you can add some other mods to balance it.
The datapack also added two new structure [​firelink shrine] and [​genshin switch], in which the first structure could summon the new boss.
The newest version is always on github, so try dowload from github instead of from other links