Deep slate veriants

Was thinking since cave and cliff be in two parts. Since diamonds will be lot more then what we are use to in old generation would be nice to have more of challenge under y0. Like we got the warden but he will only be in deep dark so what if we had mobs variant called deep slate (inserte mob) and they would be more stronger depending on the difficulty like easy they get extra two heart well hard/hardcore would be extra five hearts and either x1.5 or X2 damage.