Namo:
The southern region is generally more dangerous than the north.
So for now, I want to send you to the less dangerous region to reduce the number of dragons and Undead there. On the north side of Dragon Valley, you'll find Mesmer Dragon, Gargoyle Dragon, Black Dragon, Emerald Dragon, Sand Dragon, Dragonblood Captain, Dragonblood Minion, Cave Servant Archer, Cave Servant Warrior, Metal Cave Servant, Iron Cave Servant, and Headless Knight. You need to slay 100 of them.
Until we can figure out where they're coming from and how to fix the situation, we're just going to have to try and remove the danger some other way.