While Elden Ring's co-op is definitely better than Dark Souls', it's far from perfect. Calling other players still requires consumables, you are limited in the use of a horse, and as soon as the boss is defeated by joint efforts, you will be immediately separated.

This mod will randomise almost every item in the game, both items found throughout the game and items dropped from enemies. This is the Elden Ring version of the Dark Souls III item randomiser and auto equip mod with improved stability and utility.

The intention of the mod is primarily for mod creators to use the source code to inject their mods into the game at runtime with the launcher, however it might also be quite convenient if you just don't want to play with EAC.