Zook is a weathered Rock Gnome with skin the color of tanned leather and hair like a shocked cloud of white static. He wears heavy copper-rimmed goggles that he rarely lifts and indigo robes stained with ink and soot. His fingers are constantly stained with lead and charcoal from drafting diagrams. He carries a quarterstaff that is actually a repurposed surveyor's rod, covered in precise measurement notches.

Zook is incredibly methodical, almost to a fault. He does not believe in magical inspiration or divine talent, instead viewing the weave as a series of complex equations to be solved. He speaks in a rapid, monotone drone when explaining his theories and often forgets that others do not share his obsession with the exact temperature of a Fireball's core.

Zook was the least gifted student in his academy. While others performed minor miracles with a flick of their wrists, Zook spent years mastering the basics through sheer repetition and mechanical aids. He eventually became a Sage at a prestigious library, where he spent nearly a century documenting the laws of thermodynamics in relation to evocation magic. His decision to leave the library was spurred by a desire to prove that persistence and precision are just as effective as raw intellect. Now, he travels with adventuring parties, acting as a tactical demolitionist. He treats every battle like a lab experiment, meticulously recording the results of every spell he casts to further refine his limited but practiced power.