So, I am fleshing out a city I've decided to add to my homebrew world, and have been doing some research into the draconic pantheon and I've settled on some ideas for the premise of the city.

The city is rules by Dragonborn with Kobold slaves & servants, depending on their status. It is a trade city which is borne across the desert to new destinations on the back of a colossal and ancient dragon tortoise (like a dragon turtle, but land-based). There are multiple clans of dragonborn, with the two strongest vying for control of the city. The city market is open to anyone, but the city proper is dragonborn only (and kobolds, to serve).

I have started to flesh out the religious beliefs, which are that the city started with worship of the full draconic pantheon, and was host to Zarkun, a Prophet of the god Zorquan (god of dragon-ness). Their beliefs are that there will be a second coming of the Prophet Zarkun*, but it hasn't happened and over several centuries the city has lapsed further into worshipping the gods Task, Astilabor, and Lendys (greed, wealth, and harsh justice). The ruling clans have become greedier and have accumulated most of the wealth. The lower clans have moved more towards a "civilized" society of trading, paying taxes, paying rent, and all that rubbish that people become adventurers to avoid worrying about.

I want to create a provisional story arc for this city where the Prophet Zarkun returns, and finds the city is not dragon-y enough for his liking. The ideals held by dragons are "Wealth, Pride and Status". I figure that the dragonborn of the city becoming happy with their lot in life and settling for comfortable rather than making efforts to climb in status would constitute the reduced dragon-ness and incite Zorquan's wrath (Zarkun being Zorquan in the form of a white dragonborn), but I'm keen to see if anyone has a more brilliant idea for the city to have become more obviously un-dragony!

So, how would you have a city of dragonborn anger the god of dragon-ness (IE, being like a dragon)?

*yes, this is an Easter egg. No, I'm not ashamed.

Well, maybe the dragonborn could be interacting with other humanoid races, treating them as equals or even as their betters in some circumstances. Also, maybe in the society of the city, many dragonborn are more focused on political power than physical strength, so those who are truly strong are delegated as pawns, not leaders.

You could always have, as a mark of their fall from true draconic heritage, the weakening of the populace. That their breath attacks are weak and ineffective and their bodies and hearts have gone soft (aka lacking the Dragon Fear and Dragon Hide feats that were once common). You could use the presence of these feats to denote those Zarkun finds as "worthy" Dragonborn for his city.

The city could be suffering from a recent event like a war or a natural disaster. This forced the the ruling clans to dip into their vast horde of wealth so they can rebuild the city and maintain order. This event could also cause some sort of revolution among the lower clans that drives them even further than the traditional dragonborn.  

You need to figure out what you think Dragony means and then reverse it.

Like to Dragonborn believe in sacrificing warm blooded beings.