For my homebrew campaign.
Elderpine keep is a gigantic castle with multiple levels/tiers. Inhabitants within the walls: approx. 100.000 before the fire. Approx 80.000 after the fire.
City overview map: https://inkarnate.com/m/A1kRqd--elderpine-keep/
Tier 0: cave complex with below ground harbor (https://inkarnate.com/m/79nmW8--elderpine-keep-tier-0-harbor/)
Tier 1: commonfolk/traders/craftsmen (https://inkarnate.com/m/L5xv1L--tier-1-elderpine-keep/)
Tier 2: military and combat training grounds
Tier 3: Libraries and universities (https://inkarnate.com/m/E5ZEX2-elderpine-keep-tier-3/)
Tier 4: Nobility
Tier 5: Royalty
Tier is the tier where the army is stationed and the weaponry is stored. Only soldiers and armymen and -women have acces to this tier. Other inhabitants of the keep can use the large corridor access to the higher tiers of the keep. This tier furthermore has all the neccesities that military traininggrounds should have: Baracks for soldiers and officers, combat training grounds, archery ranges and weapon and provisions storages. Points of interests are the airdock (which is the only airdock in the keep) and the Geyon arena in which gladiatorial showdowns are hosted. Don't worry however, no contestant is killed during these epic fights.