Watering the plants himself would waste some of Levi's cultivation time. If he could refine the Cloud Mist array and make a few sets to cover all of his herbal fields, he could rely on the arrays to gather the ingredients that were beneficial to the growth of herbs and nourish them continuously. This way, Levi could free up his time.
Refining a Cloud Mist array required 144 types of spell runes and 12 array items. Each array item needed to be solidified with the corresponding spell runes and placed at a specific position.
It was relatively easy to find the materials for crafting such low-level arrays. Levi had asked Manla to collect some from the Blacksail Wizard Market. These materials allowed Levi to craft about 20 Cloud Mist arrays. The materials for crafting a Cloud Mist array cost about 100 Aether Stones, which was not expensive. It was much cheaper than making an alchemical creature like the Swordsman Mantis.