I have already implemented a "Yrden Sword" effect for Rend (only works while Geralt is in White Wolf mode). I took this from the excellent Magic Spells For Signs and Weapons mod (https://www.nexusmods.com/witcher3/mods/3346/).
I will look into adding additional effects to the other signs, most likely as part of their slot bonuses and/or effects granted by unique mutagens or other skills.
I have already implemented a "Yrden Sword" effect for Rend (only works while Geralt is in White Wolf mode). I took this from the excellent Magic Spells For Signs and Weapons mod (https://www.nexusmods.com/witcher3/mods/3346/).
I will look into adding additional effects to the other signs, most likely as part of their slot bonuses and/or effects granted by unique mutagens or other skills.