So I completed the puppy quest and was able to avoid the ants at lvl 2 completely but I went back to the pc cave and upon entering the 2nd level I heard "you hear the footsteps of the royal guard."
I had been lucky enough to find a scroll of detect gold. I read my scroll and noted where the vault was - it wasn't too far away from one of the hallways - maybe 3 squares I estimated.
So then I went and hunted down those pesky ants - but instead of attacking them I tamed 4 of them with my music skill and my mandolin. I then led them into the hallway and kept waiting around and eventually they crushed the walls to dust around me enough times in that area that it cleared the way to the vault.
Woo hoo!