All that we see or seem

There is no such person as Betty Hearthstone.
There may have been, once. There were memories of a short lady with a genuine smile peeking out through some heavy armor; but the mind is a funny thing, and cannot always be trusted. A few objects bare her name: A line in a legal document, tucked away in Dejune's archives, q small brass plate screwed to a chest that had sat in storage for months, and would continue to gather dust for many decades to come; but these things could have been accidents, or placed by some malicious entity.
Certainly the multiverse was quite sure that there is (or was) no such person as Betty Hearthstone. Divinations fail quietly, and appeals to higher powers for answers are ignored or met with confusion. But some people remember her, convinced she existed. The Great Downward adventured with her, and considered her a friend. What happened to her, after they were forced to leave her behind in the Ways?
Lurking beneath the muddy soil of the Valley is Rappan Athuk, a vast labyrinth of natural caves, rivers, and carved fortifications. In its depths is a small crack, leading to a place where time and space are folded back and forth and through one another, a snarl of magical energy knotted around itself. Things that live near it call it "The Ways", and endeavor to steer clear of it.
In the center of The Ways (if indeed the term "center" could be applied here) is a single mind. Not mortal, not divine, but an idea of thought and control. The mind could see and comprehend The Ways in the way nothing else could. It could see every room and corridor, and the laws that governed them. It could see the creatures that roamed its halls, and sense their loyalties and faiths.
The reason for the mind's omniscience was not due to any power or supernatural sight, but rather a kind of proprioception; The Ways were as a body, and the mind could track and flex it at will. The mind's nervous system was in the form of a white mist that floated through the manifold passages of The Ways, transmitting its thoughts and providing the energy to enact its will. 
The mists were formed of positive energy, toxic to living creatures. Those that passed through it were first afflicted by red welts as their skin cells began to multiply rapidly. Then pain would set in as their muscles became too strong and began to break their bones, which in turn rapidly began to heal in unusual ways. Finally the creatures would drop to the ground as their brains were healed of memories, and their mortal fears. Soon they would stop breathing altogether, before slowly crumbling into dust.
Some creatures did exist in the mist, however. Strange creatures, some made of flesh and bone, others took an ethereal form. These creatures should have been dead, or had once been dead. Where once negative energy to had compelled them to seek destruction, now positive energy drove them in search of serenity. Some were mindless, mere husks or skeletons, that wandered The Ways randomly, ignoring all they passed. Others retained their intelligence, and moved about with purpose, considering their actions and planning ahead. What they were planning for was difficult to say: they marshaled the mindless ones in their thousands, corralling them into areas that were then sealed. Some made use of the stranger areas of The Ways to make things: Art, weapons, clothes, and other strange things of glass and metal that seemed to serve no purpose, but which the white mists nonetheless demanded. 
The mind reached out through The Ways, and touched every aetheric creature, counting the hundreds of thousands of them, feeling their warmth, their drive. The mind wrapped back to its source, nestled on a throne in a room full of books. Upon the throne was a strange creature, with the body of a bull. Armor had been reverently constructed and fixed to it, so it was a beautiful pillar of mithral and silver. In one corner was a leather backpack, with a few objects that none had bothered to clear away. The mind pondered the pack for just a moment. Somewhere else in The Ways, an aetheric in the shape of a child dug its finger into some soft stone, and wrote the letters "SUCCOR". After a moment it added "BETTY WAS HERE". A moment later, the creature forgot why it had done so, and wandered off to complete its task.