Description

Leader of the itinerant group "水闘獣の針団" normally based in the Influss kingdom offering construction and maintenance services to outlying villages.

Diethelm taught Avaro everything he knows about his craft, in return Avaro taught Diethelm the secrets of mechanical weapons leading to Diethelm's wielding of the mechanical crossbow as his preferred weapon.

He has a wife and child, over the course of the story his second child is born which is a factor behind his decision to take up Avaro's offer of setting up shop inside the castle after an "accident" involving Diethelm's caravan and the castle jack operation.