The Catacombs

The Catacombs are a sprawling system of tunnels and chambers beneath Il Serine. According to legend, the Catacombs were originally built to house the skeletal remains of the god Sestus, but the exact location of the remains within them has been lost to time. The exact size and span of the Catacombs is largely unknown. Certain areas are easily accessible from entrances on the surface, and devotees to the god Thymis have converted some chambers into small temples. Several locations within the Catacombs have been mapped out enough that even those unfamiliar with the tunnels can find them, but attempting to reach them without a guide can be incredibly risky, and locals strongly discourage it. 
Urban legends claim that the Catacombs are home to a vast web of criminal activity tied to the Underworld, but few Sen Shaerans believe it. 
== Locations ==
=== The Hall of Mourners ===
The Hall of Mourners is the most well-traveled location within the Catacombs, situated directly past one of the surface entrances. The Hall of Mourners is a long, wide hallway with many side rooms used for wakes and funerals. Murals of scenes from Sen Shaeras' history line the walls, and although no natural light comes in, clerics and mourners keep so many candles and lanterns lit that no corner is left dark. 
=== Temples of Thymis ===
There are at least four known temples to Thymis scattered throughout the Catacombs, each tended by a small cloister of clerics and at least one paladin. These clerics primarily perform funerary services, but some are said to be capable of healing children of illnesses and injuries that few others would dare attempt.
Clerics of Thymis are known to venture out into the farther reaches of the Catacombs to leave food, water, maps, and light sources for those who may have gotten lost.
=== Martyr's Rest ===
Martyr's Rest is a tavern built directly below another tavern on the surface called Angels' Share. Martyr's Rest is owned by a tiefling named Torment, while Angels' Share is owned by their half-sibling, an aasimar named Sanctity. The two play up a vicious rivalry and weave tales of murder attempts and decades of hatred, but they've actually been very close their whole lives and still live together.
=== The Reliquary ===
Somewhere within the winding labyrinth of the Catacombs is the Reliquary that allegedly holds the remains of Sestus. Some of the more occult worshippers of Sestus make pilgrimages through the Catacombs in an attempt to find it, believing it is Sestus' body that should be worshipped, not his spirit. Few of these occultists return from their journey, and those who do always admit to finding nothing of substance.