@Beast Wolf: In D&D 5th edition, there's a "passive perception" stat, where the DM/GM/narrator is that one that checks if your character can notice something. He can also secretly roll for it, tough that usually leaves players nervous anyway. Some DMs rolls randomly for that.
Ovis Militaris
7 months ago
The DM giveth, and the DM taketh away. Fear His power to warp reality as he sees fit and His amusement from toying with Entropy.
Beast Wolf
7 months ago
This reaction is why the game arbiter should not inform you that you do not see something if none of the players can see it. Unless they want to tell you to pretend that you do not see it, which can be funny.