"Beyond life there are'—his face grew ashen with terror—'things that I cannot distinguish. They move slowly through angles. They have no bodies, and they move slowly through outrageous angles...God, they are breaking through! They are breaking through! Smoke is pouring in from the corners of the wall. Their tongues—ahhh—"
Hounds of Tindalos are creatures from outside the reality @gol exists in. They only interfere in Golarion when a spellcaster foolishly summons one or when someone interferes in their domain. They have some sort of connection to the angles of reality, which allows them to appear anywhere and at any time on Golarion as long as they appear near some physical angle.
The Fellowship was attacked by these creatures underneath
Carrion Hill.
Appearance
Hounds of Tindalos are horrific looking creatures whose appearance is as utterly alien as their origins. In stature, hounds of Tindalos appear like some foul mixture of humanoid and sleek big cat that is without fur and whose flesh is pallid and muscular, yet lean as if starved. This strange mixture results in their odd body shape and, despite their long arms ending in dexterous, flesh shredding claws, they usually move about on all fours. Their faces are possibly their most alien feature with huge, black, soulless eyes sitting above a chasm of a mouth filled with razor-sharp, broken teeth.
Abilities
Hounds of Tindalos understand time and space in a way no other creature does and can move effortlessly across huge distances and even across the planes themselves. A hound's mind is so otherworldly that any creature that gains direct access to a hound of Tindalos's thoughts is assaulted by the completely alien nature of its thought processes. The gaze of a hound of Tindalos rips through the very fabric of reality itself inflicting horrific wounds on its opponents.
Related or Referenced
