Are the actual Demon NPC's no longer active?
They are.
Yeah...the people playing the Netherworld have been using that tactic for a while now.
It is how they brought the walls of Reeds and Keffa down from the 5 they were at the start of the Invasion.
Just kept sending little guys in between big waves so it was impossible to mount repairs on the walls...
You know, instead of giving snide commentary, you could read what he said, which was that the SAME group has been stuck at 5 daimons. Meaning there's a bug, not some evil strategy.