I had auto explored the entirety of Briagh's Lair and had to look for him manually since he was no where to be seen.
After some exploring I found Briagh the Wyrm stuck in a hole in the wall. I assume he spawned there when the level was made and couldn't dig his way out unless he had spawned in the main areas. I ended up having to dig Briagh out with the Tooth since he seemed incapable of doing it on his own (he kept moving back and forth in the small space).
I since lost that game and started a new one so I don't have a log. Still, it was a rather amusing bug... The wyrm who couldn't dig.
v.1.0.0 Briagh stuck in a hole in a wall
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Re: v.1.0.0 Briagh stuck in a hole in a wall
Same with the sandworm queen. And you can't dig on that level 

Re: v.1.0.0 Briagh stuck in a hole in a wall
what do you mean you can't? The tooth of the mouth digs faster then the tunnels collapse.
Re: v.1.0.0 Briagh stuck in a hole in a wall
Yeah, I used the tooth of mouth to get Briagh out.