Yeah, well it shouldn't be that hard to code Darkness sight for ranged attacks. It already exist for melee.
The problem is, that in order to make Darkness function as it should, its behaving as a wall ...
Now they need to figure out how to make this invocation make it work as if its not there at all.
Wich would most likely be easier way to fix it imho ...
Implement bypass over whole darkness function, for characters with Devils sight.
