Pitfall

A void opens below the player

The bottom drops out, seriously! Air is just too thin.

GRIEFING ALERT

This mod will grief your world badly. Ask your friends before griefing their worlds.

Try the code:

player.onChat("pitfall", function () {
    for(let i = 0; i < 10; i++)
        blocks.fill(blocks.block(Block.Air), positions.create(0, -5, 0), positions.create(0,-1,0))
})