This mod adds up to 50+ items and weapons from ds3 and elden ring, all items with different abilities or skills, most of the weapons or items just uses shift+lclick or rclick mouse button to use skills, some skills work with shift+swap hands key or lclick and rclick.
You can use the block energy crafter, upgrade table and steel furnace to craft weapons and items, the recipes are in the PDF file, upgrade table allows you to add any enchant to any item, applicable even for other mods.
A wiki named Welcome to Champion's Ashes.pdf in the jar file describes almost all weapons and skills, but this mod is actually a datapack+resourcepack, so command /loot give @s loot championsashes replaces give items, or you can use function championsashes:all_in_one to get all items at once.
A boss called Nep Elder could be summoned at the center bonfire of the structure firelink shrine by throwing 64 amethyst shards, mostly generated above the ancient city with mountains on it, the boss is quite hard with vanilla equipments. Or you can just use command /function championsashes:entities/drakeblood_knight/nep_elder/summon to summon it.