By the Grace of the Gods, (Light Novel) Vol. 17

Tasked by Duke Jamil to treat and develop a mountain rife with cursed energy, Ryoma takes this opportunity to kick his warlock training into full gear. While his slime and goblin familiars work hard to rapidly pave a mountain path, Ryoma continues to shock his friends by accidentally designing hexed products. However, his projects are interrupted when a shady noble appears...