I thought Aldruhn was made of giant bug shells? Sadrith Mora has the Telvanni Council which is in a living building same as any of the Telvanni towers in the east: Tel Mora, Tel Aruhn, etc.

https://en.uesp.net/maps/mwmap/mwmap.shtml

Oops I'm thinking of Sadrith Mora! Aldruhn has the giant crab shell building.

ah, my correction stands corrected. It is definitely Sadrith Mora (along with pretty much every other Telvanni town).