Collin and the city of death (a spinoff to @xjarutox's story)

A summer has past after Collins friend Julian became aware of the supernatural world and Collin has found himself in an unexpected circumstance... a field trip to the city of death lead by his uncle grim and Collins supernatural friends this whole break of school work should be fun right? if only... something sinister lurks in the city an unknown foe threatens the peace between the afterlives and an ensuing war could lead to chaos on the living world. With all the hell lords and divine representatives as prime suspects, the only one collin can trust are his friends. But will they be up for the task? or will death claim them all.