(First off, I should let you know I've changed the name of the temple about 10 times already, I can't seem to decide on a good one. Now that that's out of the way...)
Temple of Çellenne
Çellenne is the elven goddess of Justice. Her symbol was often featured on the old empire's more imperial structures, and was thought to even able to maintain the impossible balance between the predator and prey type races. This diety was somehow carried over to Ur-Sagol, though the reasons behind how and why have been entirely lost over the years. When the destruction of Ur-Sagol was all but certain, the survivors who made it to then-neko village of Negav would construct a shrine to this same goddess in what is now the Higher Tier of the city.
The Temple of Cellenne has become more than just a smalltime cult since then. This is currently one of the most visited religious temples in the city, and their side chapel holds a memorial to the innocent lives lost over 2,000 years ago. Regardless, it is one of the few places you'll find humans nekos and elves together - something that is either a source of pride, or a source of great annoyance depending on the elf...
The temple has had a long practice of "sentinels" as well, existing to protect their holy relics. This is one of the most unique parts about this temple - sentinels use a "forgotten" style of Thaumaturgy (that is guarded very well) to make a deal with not a demon, but an angel - which is incredibly difficult to do given angels tend to be far more discreet and difficult to contact than demons. The sentinels imbue a special instrument they learn to play, and it becomes the source for their "holy magic" allowing many unique abilities. Beautiful sounds sometimes emanate from their instrument when they use their abilities.
These days the temple sentinels don't appear to do much except practice their sacred tradition. In recent history, however, the temple miraculously survived the Great Destruction, and has expanded much since then in both construction, and parishioners. "Çellennism" as it is often called is one of the few branded an official religion - as the priests are often patient, don't try to seduce one to join, and contain ideals more similar to peace and justice than a particularly object or goal.