Barthel

 (バルテル, Baruteru) was a former slave who was bought for 680 gold by Mukoda Tsuyoshi to work in his business.

Appearance
He is 92 years old and about 150 cm tall but is broadly muscular with a full beard. H carries a battle hammer (a fine piece is something) he acquired from a master craftsman in Duran after endless persuasion.

History
Barthel was once a B Rank adventurer who, in a certain failed quest, didn't use his special weapon as the penalty payment thus he was turned into a slave since he wasn't able to pay the penalty fee otherwise.

In the House of Mukoda, he acted like a teacher along with Tabasa, using his vast experience and knowledge.