Recently, an enthusiast with the nickname therealsqueam created an Elden Ring crossover with The Witcher 3 Wild Hunt. He expanded the protagonist's arsenal.
The "Witcher - Moveset Mod" allows you to use authentic swords in the FromSoftware game: a steel sword and a silver sword, created for killing undead, ghosts, etc. (deals holy damage).
Witcher signs are also available: Aard, Axii, Quen, Igni, Yrden — they have similar capabilities as in the original CDPR game, for example, Quen will grant a barrier, and Axii will force enemies to fight on the hero's side.
The "Witcher - Moveset Mod" is distributed free of charge via Nexus Mods.