Goblin Level: First thoughts

I have been giving more thought to the NPCs and opponent characters that will populate the adventure.
In particular, I have been thinking about the goblin caves that lie just above the tech level of the dungeon.

Previously, I was thinking that the goblins would be holed up above the town, waiting to mount an offensive to overrun the humans below, all the while being influenced by the strange effect of the mountain itself.  Thinking about it more, I think that the goblins should be indifferent to the humans. One of the features of the dungeon is a sort of pull exerted from the lower levels, which compels occupants to delve ever deeper. Such is the case with the goblins, who aspire to travel to the lowest depths of the dungeon, They have had little success, unable to overrun the cultists and Ta'ak below.

The goblins have been pilfering gear and objects from the tech level, with hopes that they use them against their enemies below.

-Aaron