The Curator is a mysterious fey power found around the forests of Isonhound, often times working for mysterious reasons and asking favors and demands of the mortals of Quelmar for what he deems is ultimately "the greater good"
Interferences
The Curator interacts with Quelmar only in dire times, interfering in ways often described as "putting a thumb on the scale".
The Umbral Flood
In the months leading up to the Umbral Flood, which devoured Isonhound, leading to shadowfell energy to decimate the forests and kill unknown numbers, was perhaps one of the most Curator-interfered points of time. While the Curator couldn't stop the Umbral Flood, it's generally agreed that his actions beforehand seemed to be an attempt to stop it, rather than cause it.
His first appearance at the time was in 825 PR where he took the form of a frog in Direheart Pond. After being kissed, he took the form of a naked satyr and an elegantly clothed elf, reinforcing that he was one with the sylvan and elven nature of Isonhound itself. It was there that he introduced the Isonhound heroes to a major secret: At the fringes of Quelmar and the Shadowfell in the space between the planes, a Shadow Forge had been set up.
Possibly thinking that the Shadow Forge would be the source of Isonhound's Umbral Flood, the Curator put a heavy thumb on the scale and lent a shocking amount of power and intel to the heroes of Isonhound on an assault that would be later known as The Shadow Forge Shutdown.
Behind the Screen
The Curator is inspired by a number of "hand-wavy" fantasy and science fiction characters such as "Q" from Star Trek or the titular Doctor Who. When and where he appears can seem to be random, but is almost always in a scene of great importance to the fate of the realm. His shape shifting also bears a resemblance to DC Comics' Mr.Mxyzptlk.