Deep dark stealer

The deep dark is a bit empty of mobs other than the warden. I think there should be a mob that pretends to be a skulk sensor or a skulk shrieker. It starts chasing the player when they get too close. It should be more common in the ancient cities. This mob can run a little faster than the player but will not move more than 30 blocks from where it was hiding. The mob will be able to see but can't tell the difference between other mobs and the player. This would be a cool concept because it prevents players from blocking off every skulk sensor/ skulk shrieker with wool. The mob will not be able to do damage, but it will steal an item from the player's inventory. The rarer an item is the more likely it would be stolen. For example, you could have cobblestone, a wooden sword and a diamond sword, the diamond sword would have a 60% chance of being stolen and the wooden sword would have a 35% chance of being stolen. If an item gets stolen, you can get it back if you kill it before it goes back to where it was. I think this would make the deep dark a place people will not want to bring their netherite gear, therefore making it harder to kill the warden.