Youre actually looking for the Central Cavern outside the Seal of Flesh! Head south east from there. Also the quest with GIgi is completely separate :) There may be small changes depending what order you do them in tho :>
I'm in the Central Cavern. you can see those white symbols there and that goblin.
The names are a bit confusing (I've been meaning to change this) but you wanna go outside the seal of flesh
