Skulduggery - Identify Security

Secure areas are rarely impenetrable. A skilled character can always find a way into a secure areas, whether it be a military fort or the vault of a bank. Characters wanting to enter and navigate such areas have a lot of information to analyze: guard patrols, locked doors, oracle spheres, guard hounds, magical dampening fields, key holders, etc. By using the Identifying Security Vulnerabilities subskill, a character can identify exploitable weaknesses. How this information can be of used is up to them.
Identifying vulnerabilities generally takes time as the character either observes the area or studies maps and documents concerning the location. Properly observing an area could take hours if not days. This author recommends that surveying a location takes either one hour or one day per difficulty die in the check (prior to upgrading).
In the event the PCs have to secure their own site, for example, when they are protecting their own safe house from raiders, the GM can have an adversary make the Skullduggery check and exploit flaws in the PCs' plan. Should their plan seem flawless, something could go wrong between the planning phase and the plan’s implementation. Maybe a guard will fall asleep, or an oracle sphere might have a blind spot. Symbols could also be used to add environmental effects, such as a downpour, making stealth easier.
In any case, clever thinking should always be rewarded and a well established security layout should increase the difficulty of the check.
The difficulty is based upon the location the character is identifying. The more complex and secure, the more difficult.
EXAMPLE OF AN IDENTIFY SECURITY VULNERABILITIES CHECK
Elysha is an alvain infiltrator. Her people are at war with the neighboring human kingdoms and she has been tasked to retrieve the humans' battle plan. Right by the forest's entrance, the humans set up a camp, preparing for an assault. Elysha waits for the night to provide her cover and surveys the camp. The camp consists of multiple tents surrounded by a crude wooden palisade. There are guard patrols, watchtowers, and even a few dogs. Since she is looking for a way in, she has to study the humans' behavior, shift changes, meal times, etc.
The GM tells Elysha's player that a proper survey would take 2 days. Elysha cannot wait for much longer as the attack might be imminent. Therefore, she studies the camp for a single day.
The survey requires an Average (dd) Skulduggery check. Since Elysha spends one fewer day to study the camp, the GM adds a b to the pool. The alvain benefits from the concealment of the forests as she hides in the tree branches, allowing her to be virtually undetectable during her observation. This grants her a b.
The check generates sssa. Each of her success grants her a usable piece of information. In this case, the GM goes with the following: there is a spot in the wooden palisade that has a breach. Two logs have fallen out and they have yet to be repaired. Someone could slip through this opening Instead of using the main entrance or climbing over the palisade. Then, she notices that the dogs get fed right after the men. During that time, they are less likely to catch the scent of intruders. Finally, the captain of the camp goes to the outskirts of camp to smoke his pipe. Elysha's player spends the a to have bushes close to that breach by the palisade. This would grant her a b on her Stealth check if she chose to go this route.
With the acquired information, she will be able to get into the camp and steal the plans unnoticed.