Otherworldly predators from beyond the bounds of known reality. They appear on the Material Plane seemingly drawn to places and people where reality or time has been warped. They have never shown evidence of communicating with or understanding mortals. They do not care. They hunt. They are outsiders, and no one is sure what or where Tindalos is.
A conglomeration of blue and red blood vessels, loosely in the shape of a wolf with a five-foot long mouth and a seven-foot long probing tongue. The ends of the tentacles that make up this creature drift into smoke at the edges. Visual contact with their sight organs can tear one’s flesh apart, but what their sights organs are is unclear. They can, as a swift action, greater teleport to any location that has a corner and emerge from permanent hard angles.
Anyone attempting to make mental contact with a Hound of Tindalos will take damage and be subject to a confusion effect. They have DR/magic. Spell-like abilities include slow, haste, invisibility, and air walk at will. Locate creature. Any target of its gaze attack that makes its save is immune to the effects for a full day.
According to Melisenn’s journals, the Hound in Iris Hill was not affiliated with anyone working with her, and materialized for no apparent reason about two weeks earlier (roughly at the start of the adventure).
When Elder Lythiin, Stazi, Stanhope, Tharivol, and Nheb entered the Mysterium with twelve Stewards of the Vault in Act IV Interlude Part 2, four Hounds of Tindalos emerged from a mirror on the University Level and promptly slew six of the Stewards.
The main party encountered four more Hounds upon their entrance into the Mysterium in Chapter 176.
First Reference: Chapter 66
Other Notable References: Chapter 67, Chapter 86, Act IV Interlude Part 2, Chapter 176, Chapter 183