Slippery nether trenches

Would randomly spawn in the nether waists. These trenches are around 26 blocks deep and at the top 7x7 blocks wide and the deeper you get the tighter it gets so at the bottom 4x4 or rarely 1x1. At the bottom of these treches there would be a new stone-like block 'Slippery rock' that can only be mined with a diamond and netherite pickaxe ( because it is too splipery for other pickaxes) and if you try to mine it with any other pickaxe it will slip outta your hand. Slippery rock will work the same like ice but only with mobs (except silverfish and endermites) falling next to it will boost any entetiy's fall and make it take more fall damage. The following cannot be placed on Slippery rock: torches, ladders, item frames, pictures, end rods, etc.