Sorcerous Stabber Orphen: The Wayward Journey Volume 2 by Yoshinobu Akita

Orphen's wayward journey continues as he pursues the dwarf brothers Volkan and Dortin, who have absconded with a dangerous artifact known as the Sword of Baldanders. His two companions, Claiomh Everlasting and Majic Lin, however, are not used to traveling such long distances, so the group stops off at the popular tourist destination of Alenhatam along the way. But an ancient, slumbering secret has been awakened beneath the depths of the city; one that could threaten to wipe out the very nature of sorcery as the world knows it...