The dark dimension and possible ideas

Dark dimension would be only accessible through the city Centers in ancient cities. To enter this place, you need to right click one of the reinforced deep slate with a sonic core, which can be dropped by the warden. The sonic core would be an item and when you right click the reinforced deep slate with it, it allows you to enter the dark dimension which is basically the deep dark but darker and more dangerous. Instead of deep slate the dimension is mostly “dark stone” a block which I’ll leave Minecraft to design. The loot found here would be better than the end cities and some enchants that can’t be found elsewhere. Such as life steal which can be placed on swords and will heal a user who attacks a mob with the sword, more health for more damage and it will heal 50% of the damage dealt. Another one is an ore called echostone. It screams when you mine it and can be used to make echo crystals that can be used in armor trims and causes armor to glow. I’m sure other things can be added like a new boss mob etc. But I hope you consider adding this as the portal in the deep dark is more of a mystery and finally having something useful when killing the warden would also be a treat.