The new low-level dungeon.

[Griss]

This is from memory (my client crashed, and I can't get back in), so may not be perfectly accurate!

That said, head south from the Halatali aether gate, and just a little bit east. The green dot from the NPC at the entrance should be visible in the mini-map. He is down inside the beginning of the tunnel complex. There are two short tunnels, both of which lead down to him. It is in an open area -- no walls or cave complexes.

This area has been here since release, but is now surrounded by antlings (since 1.18), leading to my speculation. Enjoy!

there is also a similar grouping of ant burrows in between broken water and the red labyrinth. But your correct the antlings definitely seem to be much more active these days. Hell there seem to be more of them now then when the game launched.