Claystone Heights is home to adventurers of many folks and origins, but Yingax is one of the most unusual. Yingax appears as a haphazard conglomeration of limbs, faces, and other features, joined together into a single patchwork person. There's a good reason for this appearance: Yingax in fact originated as six separate people, a party of adventurers that twelve years ago was investigating a magical castle. Some curse or weird enchantment joined the six together into a single entity, merging them in mind and body, and they've stayed that way ever since. The name they chose, "Yingax", is made up of the first letter of the names of each of the individuals they once were. Despite their origin as six different individuals, Yingax now seems to be mostly a single gestalt person with a single mind and personality... although occasionally one of their old selves does seem to slightly surface, and there's some ambiguity as to just how thoroughly subsumed they all are. In any case, Yingax has no interest in trying the separate themselves back into the six people they once were; they're happy as they are, and they claim (perhaps disingenuously) that the six adventurers are better off like this.

Yingax is a member of the gallards' guild of the Rose Company, and still goes on frequent missions. They often go alone, considering themselves a (with some reason) a one-person adventuring party, but sometimes they do take companions along, especially with the goal of helping train new adventurers and give them experience in the field—in which case they may let their "assistants" take on a task alone that Yingax judges they should be capable of. Despite their bizarre appearance, they are known and respected enough in Claystone Heights to be recognized and accepted there, though they may certainly attract attention elsewhere.

Yingax is a roughly spherical mass of flesh, with arms, legs, and heads jutting at odd angles: some human, some otherwise. Despite their size, they can contort themselves enough to squeeze through ordinary doors, though not without difficulty; their own house in Claystone Heights is custom-designed to have larger doors to accommodate their bulk. Yingax can speak in four different voices at once, corresponding to the four heads that have exposed mouths, but usually only chooses to speak with one voice at a time, sometimes switching between them for emphasis. They wear bespoke clothing to fit their outré form, mostly made up of silken wraps and sleeves with patches and swathes of embroidered cloth, and leather boots on the four libs they usually walk on.