Diligence is a term for constant and earnest effort to accomplish what is undertaken.
These leves involve you defeating monsters until they drop enough of the required items. If you defeat all of the enemies, more will keep spawning until either your time runs out, or you obtain all the items.
Portrays the scene of Saint Tothor the Ratcatcher. Earn the gratitude of your peers by humbly accepting the tasks that others shun, and working earnestly to complete them.