Yal

Yal introduced himself as a manifestation of the One Tree. He lives in the Astral Plane, which he presented as a wide grassy plain with a single tree.

Physical Description
Yal is a tall humanoid. His skin has a distinctly bark-like texture and his clothing, orange dungarees and a white shirt, appears to be different colours and textures of bark. His eyes are solid green orbs, similar to Eladrin or Shadar-kai, but they glow with an inner light. Additionally, his feet appear to be soled with wood. When the party first encountered him after the events at Facility 3 he had a withered arm which he said symbolised the death of the One Tree at Fennica.

Interactions with the party
Yal initially invited the party to approach the tree and spoke to them, mostly in a series of metaphors and cryptic answers. He actively encouraged the party to come to conclusions themselves and frequently answered their ideas with 'Just so' if they were correct. The knowledge he imparted could be roughly split into five sections:

(From the Timeline) First, the process of using the One Tree as a power source that was begun by High Father Hork could not be stopped apart from through the One Tree's destruction; Second, Hork and Orcus were merely the first two beings to try and use the power, and others would be drawn to it; Third, Orcus could be stopped at Zar but ultimately could not be destroyed, as that would require a far greater power; Fourth, to enter the dome and destroy a statue being built there for Orcus to inhabit, the party would have to die, although the rings that Yal subsequently gave them would preserve their souls and prevent their bodies from being inhabited by Orcus' minions; Fifth, recruiting or gaining the aid of the gods, both good and evil, would be key to the party's efforts. Yal then indicated that their route away from the Astral Plane was behind them, but showed amusement that the party's minds could not think in the required dimensions to see it. Their exit route then became apparent as Madame Mercurio's House of Pleasure appeared behind the party.