build structures?

I am at level 50, but I don't see any options to build structures in my citadel? What am I missing?

Hmm, it's been a long time since I built so I don't recall the actual mechanic for it. Pretty sure it was just a matter of spending money to build them though. You should have several buildings showing. Did you look for a walkthrough elsewhere? The buildings let you do things like: forge weapons with the Runes, upgrade your mounts, research spells from creatures you've captured, and upgrade your skills using gold.