Claystone Heights is a place where adventurers meet and prepare, but that doesn't mean it can't also be a place where adventures take place.

Adventurers make enemies, both of other adventurers and of others whose plans they foil. Those enemies may very well seek revenge, and if the adventurers live in Claystone Heights their enemies may very well bring the fight there. Even if the PCs aren't the targets, they could end up getting caught in the middle, either because the adventurers involved are friends of theirs, because they're asked to help, or just because they end up being in the wrong place at the wrong time.

Example: Mysteriously, several adventurers in Claystone Heights have turned up petrified, turned into stone statues with identical symbols carved into their backs. If the PCs investigate, they may eventually be able to find the culprit: a sinister fey called Ydor dwelling in a sea cave south of Lüm that these adventurers had been sent to to try to defeat him. As a further twist, Ydor is—or at least was, prior to this revenge spree—innocent of any major wrongdoing; a greedy trainer named Salin Grost sent the adventurers there under false pretenses in the hopes they'd bring back some treasure she thought was concealed there.

Adventurers often have a reputation for being foolhardy or impetuous; put a lot of adventurers in the same neighborhood and there are all sorts of ways things can go wrong. Adventurers can summon creatures for combat training that can escape and cause trouble; rivalries between adventurers can get out of hand; adventurers may resort to reckless methods of practice or skill development that may endanger passersby or their surroundings.

Example: An adventurer temporarily came across a magical staff that could temporarily bring inanimate objects to life, and he's been using it to animate training dummies to give himself a better way to practice. Unfortunately, he didn't understand exactly how to use the staff or what its powers were, and his misuse of the staff has caused other various objects in the vicinity to come to life as well and run amok. The PCs are tasked with stopping all the rampaging objects, finding out what's causing them, and putting a stop to it.

There is a reason Claystone Heights is called Claystone Heights. Like the rest of the Old City, it's located on a relatively dry patch slightly elevated above the surrounding swamp, and it's built around and over ancient structures and ruins from Lüm's early days. Not only is Claystone in an area of particularly high ground, but it's also built on several layers of older ruins—ruins that can still be accessed from the surface through certain openings. Naturally, with all the adventurers who live in Claystone Heights, many of these ancient now-subterranean passages and chambers have been explored and looted... but with thousands of years of construction, there may yet remain areas that still hide undiscovered secrets.

Example: When the owners of a local bar, the Skyborne Carriage, try to expand its wine cellar, they accidentally break into a hitherto unknown underground passage... and release some magical constructs that have been trapped there for millennia. The PCs may be in the bar when this happens and witness the emergence of the constructs themselves, or they may be asked to help investigate later. Either way, this complex of chambers has been sealed for thousands of years, and almost anything could be inside...

The prevalence in adventurers in Claystone Heights provides plenty of demand for training and certain kinds of items and information, and attracts people who can and will fulfill that demand, for a price. Unfortunately, it also attracts charlatans and scoundrels who will pretend to fill that demand, and who may cause a lot of trouble through selling cursed objects, meddling with forces they can't control, or just encouraging adventurers to get in over their heads. PCs may fall victim to these scams themselves, they may know someone who does, or they may just happen to be on site to witness the fallout... or of course unscrupulous PCs might consider pulling off similar cons themselves.

Example: A new street vendor in Claystone Heights calling himself Blue Rudimund has what they claim is a magical "heroism pill" that gives adventurers the courage and fortitude to press on through difficulties and exceed their normal capabilities. What this "heroism pill" actually is is a highly addictive drug—it may indeed temporarily increase the abilities of those who take it, but at a very high cost. Can the PCs prove how harmful the pills are, and shut down the vendor? And can they help those who have already fallen victim to his wares? (Or has one of the PCs already taken Rudimund's pills before discovering the danger?)