Snowball logic to embed X number of blocks below point of impact, for placing mines, two-part block combinations, ladders of any specified depth, pits, or pits to void. Please examine in case I've derped something. It should place a block on the surface as BlockPlacementSnowball, and then proceed to place X blocks underneath, stopping at bedrock if it hits that. If you specify negative X it will place down to void without stopping.