Tony Hawk's Pit of Spikes

You choose a portion of dirt that you can see within range, and instantaneously create a circular hole 5 feet in diameter, and 10 feet deep. At the bottom of this hole is a large number of sharpened bamboo sticks. If a creature falls into a pit, they may make a DC 21 Dexterity save to avoid being damaged. The spikes deal 4d6 piercing damage, with an additional 2d6 added for each size above Medium (i.e. an additional 2d6 for Large creatures, or +4d6 for Huge creatures, so on).

If a creature is damaged by the spikes, they must pass a DC 14 Constitution save, or be inflicted with the Poisoned condition.