Carl discovers the captured siege engine can replace its Poison Cloud payload, making it an ideal mile-range herbicide delivery system.
The trebuchet taken from Dream hunters has a Poison Cloud enhancement with a small potion cup beside its sling. Pouring a different potion into the cup changes the cloud released around the projectile. A physical shot is still required, and Carl has ample three-hundred-pound rocks.
Carl stakes the eight-foot device into muddy ground roughly a mile from an Odious Creeper. Without Ping, he and Donut calibrate by counting winch clicks and observing six test shots. Once zeroed, they add Mordecai's weedkiller. The rock breaks through trees above the unseen monster and releases enough herbicide to kill it within seconds.
An eight-foot enchanted elven trebuchet with paired throwing plates, a sling, and a small poison reservoir.
The Rock Chucker replaces Carl's bulky improvised sprayers with a proven, accurate long-range aerosol weapon.