Malevolent crop circle

You're fighting a malevolent crop circle

This is a large field of grain, some of which has been flattened down to form ancient occult sigils, or possibly messages from a distant alien race, which amounts to the same thing really. Where-ever they came from, the patterns have somehow imbued the field of grain with a dark and murderous intelligence, and now it is waiting for hapless adventurers to prey on. In a small room halfway up a stone tower. Look, just... just work with me here, all right?

You are somehow beaten half to death by a field of grain. How it does that is one of the great unsolved mysteries of the universe.

You lose. You slink away, dejected and defeated.

Hints: Maybe you can get aid from some habitual destroyer of crops. Some sort of classical famine-causing eating-machine might work. If you could summon some kind of insect plague, that would definitely be helpful here. Perhaps a bronzed locust from the Arid, Extra-Dry Desert is what you're looking for.