Originally Posted by
Atmius
Remember the potential called "ancient oath"? It only activates when the target enemy is weak vs your weapon element. Fornis latent is ancient oath with 2 guaranteed elements it'll work against regardless of your weapon element, and whatever element your weapon is. So by going light on a fornis weapon, you're purposely lowering the range of enemies your weapon is useful on from 3 types (lets say light/dark/fire) to 2 types (light/dark). The only weapon type that was 'worth' making light was the talis, and that was purely because fo relies on element conversion for a significant damage boost.