A solution is rendered necessary for me because per RAW creatures in Darkness fight one another normally (no advantage, no disadvantage) and I would like to invoke a more chaotic feel. Fighting blindly against other blind creatures should feel distinctly different from fighting in a lit room!
I don't know, this is the part of your original post that sticked to my mind, with the keywords being
chaotic and
different. Your first house rule makes everyone in darkness roll with disadvantage: it definitely sounds more
realistic than the RAW to me, but it doesn't make the battle feel more chaotic nor different, only slower (because of more misses).
I proposed that you force everyone to guess where their target is, making up some rule that gives a chance to hit one of your own allies. To me that would definitely give a more chaotic feel, and it would be a different fight than normal.
Then you attacked me because my house rule doesn't follow Crawford's sage advice... I don't understand you, you are
changing the RAW with a house rule, and you worry about sage advice? :/
I don't desire to be at all disrespectful, but you have run this sort of situation much? I ask because "probably handle it" could imply that you're offering principally theorycraft.
No, I have never had the situation of everyone being unable to see. Usually when there is a fight in darkness, it's because at least
one party involved can see in it, and is trying to take advantage from it.
I'll tell you what. We stand near each other. We both close our eyes and start swinging sticks at each others general direction. Your going to be amazed at how often you get hit unless you try to hide from me. You have next to no chance of blocking my stick with yours. You won't be able to duck it. Basically if you are in my sticks path when I swing you are going to get hit. If you can see to defend yourself then you will probably get hit less than if you can can't see LOL.
***Why would I be swinging in your general direction? Because you are making noise!
I think this is pretty much the general problem, everyone is bringing up the perfect example to self-fulfill the rule they want to win.
What if I tell you instead that you have a room with 2 teams of 4 people, let's call them the PCs team and the monsters team. Everyone close their eyes and start swinging sticks at each others general direction. What happens? Who is going to hit who? And surely everyone is making noise... so everyone is capable of knowing the location of each and every enemy, and not confuse them with the allies?
The truth is that if you go with RAW + Crawford, it will be easy to run the battle, but it won't be much different from a normal fight (which is the OP's original problem he wants to address), so why bother with introducing a darkness scenario in the game?