This doesnt work in a videogame, a DM might manage how much info to tell you depending on your roll, and help you if they need to balance the combat. But in a videogame if you leave that to RNG is just another thing that can go wrong and you may never find out the creature's stats if you have bad luck (you can have a lot of arcana an still have a critical miss). Also many players already know the weaknesses to certain creatures, and this mechanic will only push some of them to use google, this is a game that already wants you metagame the hell out of it, sadly.
Just have (some of?) the information revealed after killing a monster. Representing knowledge your character has gained through fighting this monster or studying it's corpse.
This way, knowledge checks can help you get through a first fight with a monster.
But if you have bad luck, then you'll still have information for later encounters.
