Following Terron in to the earth, Walker moved with caution since many of the mages that came with needed to be focused on their magic instead of any potential dangers. Terron was a dragon and a major threat to any underground monster who were in the area.
This didn't mean that they would all avoid him though. The Sigil continent had a surprising amount of monsters with small amounts of dragon blood within them from ancient times. Whether it was from the ancient dragon who perished and were consumed or the rogue dragons who had lost any sense of sanity when the dragons of this continent separated in ancient times.
Regardless, there were also the monsters living in isolated or large cave systems underneath the Sigil continent's surface. They might not even have the ability to fear a dragon or even understand that the trembling earth was caused by another monster and not an act of nature.
