I appropriated one of the abandoned dvergr towers for forward base. It has served me really well.

The citadel exterior (you'll know it when you see it) can also serve as a solid base thanks to the prefab black marble fortification and relevant location.

But my favorite place (which I've yet to complete) is a mountain peak on my friend's world which is immediately adjacent to the mistlands.

On the current public test version, they have reduced blunt damage of gjall (and increased fire damage). That means their attacks will be less destructive on fireproof structures even as they will regain their ability to fire two bile shots as single attack again.