Here is another installment of exTRAPaganza, our Thursday over-the-top trap series.
The party comes across a huge, inverted dome shaped depression. Way down at the bottom appears to be gold. The only obvious way down is to gently slide down the sides. About 1/4 of the way down, small, sharp blades rise from the dome which are nearly invisible. They slowly grow in size to the bottom. With almost no way to stop the sliding, these will be nasty.