引用自 TheHaplessWanderer：

Does anyone know how I could add a constant effect to an item that targets the player while I have an item equipped, like blind or burning?

Best to ask Phanjam in the Runic Games discord server.
Here's the official Steam Discussion with the link:
https://psteamcommunity.yuanyoumao.com/app/200710/discussions/0/1326718197209688221/

Thank you! I will ask there.

My borther-in-arms mod, I created weapons for my musha class/companion to have innate skills upon wielding specific katanas. I probably had played around with item properties and effects on those too. You can check that out.