to start datapack type /reload
to download the datapack, press the download button then send it to your world datapack folder and then extract it

this is my first datapack so don't judge. i made this datapack just for fun and not for professional.
there is a function anvil. to start the function just type /function dpcmds:anvil.
there are recipes of: every chainmail armor, totem_of_undying, saddle, elytra.
there is only two advancements: betrayer and betrayer II. to get this advancements you have to kill your created iron golem and snow golem. when you get the advancement you get loot from an ancient city chest.