#Magic genetic engineering.
Magic genetic engineering.
In Exalted, the race of magical dinosaur-people known as the Dragon Kings used magic to genetically engineer species of plants that replaced a significant portion of mundane technology; they had everything from vines that replaced mundane plumbing to trees that grew swords like fruit, to outright magical stuff like plant-based gas masks and scuba gear or plants that made magical healing powder.
It's possible that your ninjas might use their ninja magic to do something similar!
