The underground tunnel network was extensive, allowing passage to block the demons even without heading to the node where Hilia was.
The Elf Royal City was submerged in pollution, leading to a lockdown of the entire city. The Elf King took it seriously and quickly dispatched a large number of personnel to investigate the pollution source here.
Initially, there were even Elf Elders involved.
Later, it was discovered that sometimes lower-tier mages were better suited for underground investigations than those of Tier Six, as the presence of Tier Six mages caused many demons to fearfully avoid confrontation.
In regions where pollution was rampant, a Tier Six mage was like a shark charging through a school of sardines—appearing mighty but catching not a single fish (meaning demon), so it was better to send mages below Tier Five.
